This is a very taxing card for the runner indeed. If the subroutine is not broken then they would suffer a major tempo hit, potentially losing an expensive card back to hand.

It also offers NBN a relatively cheap, efficient and taxing piece of ice to add to its repertoire. Rush and kill decks both would benefit from its inclusion.

However, it is a weak early game piece of ice because the runner could be running without any cards in play, thereby nullifying its impact. So if it is installed early, do not rez it until its subroutine will do some major tempo damage.

Regarding the R&D access option, consider the cost/benefit of activating the ice in relation to the current credit differential between yourself and the runner. It would cost you 3 credits to activate it, but the cost to the runner could be much more than this. However, the rez cost is just 4 credits once on the table, so many times you may opt not to activate it from R&D.

If you can rez this ice at a point where the runner has a lot of cards installed, and does not have a cheap way of breaking the subroutine, then this card is sure to reap a solid dividend.

As a Prepaid VoicePAD Kate "Mac" McCaffrey: Digital Tinker runner, I really find this ice to be a major problem these days!

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I think the most obvious choice for triggering the ambush would be on deep Medium digs on RnD. Unless they have a loaded Kati or some other really sweet looking target, it's probably best to just install and rez. Still, ambush ice is an interesting design space. I hope there is more to come. Also, does anyone know what happens when you bounce a Film Critic with a hosted agenda? —
The agenda would go into Archives. —

This card works best in NBN kill decks. The basic strategy is to tag the runner with Midseason Replacements, ideally with so many tags that the runner cannot practically remove them. Once this happens, the game comes down to a race- the runner tries to assault R&D for the scoring win before the corp kills them! As this R&D assault happens, reveals of this card result in a score for the corp rather than the runner.

The key point is that the agenda can't be scored by the runner, rather than that it is scored by the corp. Most of the time the corp is drawing for the killing combo and is not trying to win by scoring. So the card really delays the runner scoring out.

As a result of the above, Film Critic does somewhat hurt the potential of the card since it can void its main ally, Midseason Replacements. With the recent move to 24/7 News Cycle as a killing medium, the number of tags landed is generally reducing, and thus the runner is less likely to retain multiple tags for long.

Having said that, this card is wonderful against the current Data Leak Reversal runner decks, which tend to tag themselves as part of their attack combo. Such decks can help the corp to win on points by accessing this card. Combined with the Haarpsichord Studios: Entertainment Unleashed ID, multiple agendas in remote servers can help mitigate the mass milling strategy and give the corp a reasonable chance of scoring out.

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Nothing better than seeing Paparazzi in the runner's rig when they've already milled 3 QPMs into the bin. —
Film Critic negates the agenda itself too. Even if they are tagged the runner can take this if they have film critic. —

This is a very strong card in Spark Agency: Worldswide Reach decks, providing yet another way of reducing the runner's credits. Since it is an upgrade it can act as a dummy agenda, and further, multiple copies of this card can be placed in a single server. With Ad Blitz the card can be brought back into play once trashed too!

Looking at the numbers, in a Spark Agency: Worldswide Reach deck the card leads to a 5-credit swing if trashed (corp +2, runner -3 assuming it is the first rezzed advertisement that turn). If left there, the swing is 3 credits (under the same assumption). But in this case the runner may have to run into this card again!

The card does well defending R&D, but is also very good in a strong remote (for instance, one with Tollbooth guarding it). Installation may force the runner to check the remote server in case there is an AstroScript Pilot Program or similar agenda in there. Multiple copies of the card in a remote are sure to annoy the runner! And at some point an actual agenda could be sneaked in...as such this offers some extra possibilities for scoring and taxing after Clot is on the table.

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Still not clear how this works with Spark, because it has to be rezzed in a remote for the ID to kick in. That's before the runner decides sucessfull run or not, meaning: there's no access and it's only a credit swing of 1.. meh. —
Put it in a remote with other cards pal :) —
Also- as per the FAQ on run timing, the runner decides to access the remote server at step 4.2. At step 4.3 the card can then be rezzed, and the runner has to access it via steps 4.4 and 4.5. —
I just wanted to add that I am considering putting this in a non-Spark deck just because it's still that good. Spark does help it by taking the swing from 4 to 5 and the timing of that may be additionally useful, but a swing of 4+ by itself is still pretty good. It can still pretend to be an agenda in non-Spark. In particular, I think this is a pretty interesting way to deter runners from running stuff like Jackson Howard. You can put this as it's own remote and if they don't check it then you can install Jackson Howard in the same server. —

@Crashdown I'm assuming that the way this card works is that the corp would essentially never rez it, but rather keep it facedown in either the root of a central, or in a remote combined with other cards. Leaving this as a hidden tax whenever the runner tries to acess that server. Obvious synergies include NAPD contract and red herrings, allowing for maximum taxation (11 credits) in order to steal the NAPD, and thats before considering the cost to trash. Throw a couple of pop up windows in front of it, and you've got a serious ecconomoc drain on any runner frisky enough to make a run on that server.

This amazing card helps NBN kill decks work around Film Critic. More generally, it facilitates runner kills without the need for the runner to trigger anything. Even the most cautious of runners could be killed!

Score out Breaking News plus another agenda. Next turn, activate 24/7 News Cycle to give the runner two tags, before double Scorched Earthing (or Traffic Accident Scorched Earthing) them. Ta-da!

:)

This is the immediately obvious use of the card, and indeed it is being used in this way in a new breed of Haarpsichord Studios: Entertainment Unleashed decks.

It remains to be seen whether further uses for the card will arise over time...

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That almost unstoppable combo makes me so salty. —
I'd also like to point out what it does in Jinteki with Philotic Entanglement... —
You could arguably do the same thing in Weyland with Posted Bounty, right? You'd need two scored agendas, play 24/7 by forfeiting the other one, and then trigger Bounty, forfeiting it and tagging the runner. —
Works nice with Philotic, but you can't count on that because there is only one in the deck and you can't score it from hand. This and Breaking News is just stupid. I don't like this card. Breaking News is on MWL now (and rightfully so). But if you are building a deck around this concept, the 3 influence is super easy to pay. —

This card is great in conjunction with icebreakers that "run out", since it can trash an installed icebreaker and then install the very same one back from the heap! This possibility is confirmed in the official Netrunner FAQ.

The net result is that you can recharge a spent breaker without paying any more credits. Key targets for this card include the Cerberus family of breakers, D4v1d and Overmind. At present, we can see that the card is very popular in Prepaid VoicePAD Kate "Mac" McCaffrey: Digital Tinker decks as a Cerberus "Lady" H1 recharger.

The card is also a great way of rearranging your breakers, for example when you are at the MU limit and wish to replace a breaker in play with one in your grip or heap. Again, the card helps realize this goal at a reduced cost.

Another potential use is with Cyber-Cypher, to redeploy the breaker to another server at zero cost.

Overall the card is very strong, particularly with breakers that expend power counters.

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Another use case for Scavenge is rehosting programs. For example if you first install a program (i.e. Sage or Yog.0) then a few turns later install a host (i.e. Dinosaurus) and use Scavenge to reinstall your program onto the host. It may not be the greatest move of all times, but it can help you install things in the order you need them while still making use of hosting mechanics. Another possible use of Scavenge could be changing the amount of power tokens on Atman to better match the ICE you are facing. Again, not the greatest use, but if it gets you into a server you can't get into another way it might be worth it. —
I've also used it to cheat big breakers into play with London Library. Host on the Library, Scavenge it into play off the library, and bam. Turn one Morningstar or Torch is a beautiful thing. —
Scavenge also changes the target of femme fatale. Great to reboot à early overmind after the set up. At 0 cost, it interacts greatly with comet. test run + scavenge in 1 click is crazy! —
This was clarified by Damon - no, you can't reinstall the same program unless you have another copy of that program in your grip. —
Protege: when did this happen? The latest FAQ explicitly talks about this interaction. —