Adrenalined arsenics worked much better (with ecclipse, naturally) than the deathstalker. with 6 attack, dmg reducing shields are a breeze, so they still get 2 poison in every turn, and they're incredibly fast. Cheaper and way higher hp, plus they poison without any buffs (except animate weapons, of course, lol).
I tried deathstalkers with momentums and adrenalines, and, well, it's fairly reedonkulous. 4 poison damage a turn is just ludicrous, lol. Throw in some bone walls to help the poison do it's thing, and it's a really scary combination. Momentum means that they'll get in 4 attacks and therefor 4 poison per turn as long as they're alive and un-delayed or frozen. Oh wait, that's right, delays and freeze will only work for one turn ^_^
I'll post the deck I'm working on soon, since it can be insane on a good draw.