Underwhelming. Tag-punishment cards sit blank 90% of the game and require support cards for landing tags. If you're going to slot cards (and probably influence) for tags, the tag-punishment needs to be solid when it lands. This isn't it.
If this is the strongest tag-punishment in your deck, it's probably a mistake for the runner to clear tags.
That's a little hyberbolic, a free archer is a particularly powerful swing, is it going to directly win you the game, no, but if you blow up their sentry breaker or means to get past it with a retribution...— Nillis
I'm sad the era of gigantic ice like Wotan and Janus 1.0 is over and rotated out, with no real replacements. Because a deck with a bunch of it and Drago Ivanonv and this card to rez huge ice from Archives would be the kind of jank I enjoy trying to setup in kitchen table games.— bosky
"That's a little hyperbolic, a free archer is a particularly powerful swing." I’m not sure on particularly powerful here. Boom! instantly wins on 2 tags and when Exchange of Information was legal it was potentially game-winning on 1 tag, or at least significant progress towards a win. Those are a much larger impact than installing and rezzing an ice, which is probably not an effect strong enough to support a $5 price for Building Blocks. (Or, at least, I’ve never seen anyone use Building Blocks out of Blue Sun). Dropping the price of (let’s say) a $5-6 card to $0 is probably not enough compensation for the work and deck slots that go into landing a tag and the huge unreliability around when they will be tagged. At least, I would suggest that the card have some utility when the runner is NOT tagged, like the card normally costs $6 or whatever but is free when the runner is tagged.— superheronation