Culling the Weak is where you want to be for that sort of thing. It's not particularly good, though:
- Awful topdeck
- Need both Plunge and Explorer in opener - Zenithing Explorer still puts us a turn behind, at which point it's hardly better than Therapy
- Need big payoff card in hand - three card combo is not easy to assemble (4 if we're going for Sneak - Fatty), especially without filtering
- Doesn't actually win us the game
- Phyrexian Tower does similar thing, repeatably, in a land slot
- Always a 2 for 0, if we use it to ritual out a threat and it gets Forced the opponent is still up in cards.

