Oh man, is this a tempting card. Stealth has always had a place in the meta, and with the recent nerf to Faust people are looking for a strong AI alternative.
But stealth has always had two big problems, both of which are amplified in Dai V, and mean that this is going to struggle as a primary breaker.
First, stealth requires that you get both your breakers and your stealth-powering cards down before you can safely run. The more stealth credits a card needs, the more you need to set up to use it effectively. This slows you down, and puts you at risk of losing to a faster deck.
For a standard breaker (i.e. Refractor or Dagger), the slowdown is pretty small. These cards only need one stealth credit to be functional against any piece of ice with 5 or less strength, and with a deck stocked with Cloaks, Ghost Runners, Lockpicks and Silencers it is pretty easy to find a stealth credit by turn 2 or 3.
But Dai V needs not one, but two stealth credits to function. You can burn through a Ghost Runner in a pinch, but usually you're going to want to have two Cloaks up and running. And it must be Cloaks--it's not a fracter, decoder, or killer, so unlike Switchblade, you cannot use Silencer (or Lockpick or DFG). This limit on stealth sources makes the 2 credit requirement a significant hurdle.
Which brings me to the second limitation. Stealth puts a cap on how many pieces of ice you can break in a single turn. If you have 4 stealth credits at your disposal, and a server has 5 pieces of ice that each require a stealth credit to get through, you're locked out. Even if they haven't managed to stack a server that deep, there are many cases when you might want to make multiple runs in one turn, and once servers have been double- or triple-iced that starts to get real taxing. Ghost Runners is a temporary solution, but only temporary. Mirror gives you a boost if the first run is on R&D but otherwise is just a discounted CyberSolutions Mem Chip.
And Dai V makes this even harder. If Dai V is your only breaker, it's going to cost 4 stealth credits to get through a server consisting of a Vanilla in front of a Quandary. Even if you have all three Cloaks out, you're still going to need a Ghost Runner to support it or you will not get in. That's a huge rig to break two tiny pieces of ice--if that's your only gameplan, you're not going to do so well.
On top of that, Dai V isn't even that efficient of a breaker once you do get your stealth on. A base strength of 1 with one-for-one boosting gets to be a real problem on larger pieces of ice--that's Zu levels, and anyone who has ever had to break a Wormhole with Zu knows how unpleasant that can be. And for the privilege of using this breaker, you paid 6 to install it.
Dai V is begging to be used to fill in gaps in a stealth rig--if you can't find your Refractor, Dai V will let you threaten the corp while you dig for it...but only if you can get the right mix of Cloaks and Ghost Runners first, and that's a pretty big if.
Speculation time, though--the console in this same pack, Mirror, is clearly the console of the runner Ele "Smoke" Scovak (smoke and mirror, get it?) who has been quoted in flavor text before. A stealth console suggests a runner with a stealth ability. If that ability provides any way to get additional stealth credits, that could potentially make Dai V viable as an early game threat. We'll have to wait and see.