Necrobite

Two effects that usually live on separate cards get stapled together, and the staple is the whole point. Regeneration is a defensive grant: it keeps your creature alive through removal or an unfavorable block. Deathtouch is an offensive grant: it turns any blocker or attacker into a lethal one. Bolt them together and the result is a combat trick that wins exchanges from both directions, letting a small creature trade up against anything while surviving the swap. Block a 6/6 with a 1/1, point this at the 1/1, and the big creature dies to the deathtouch while yours taps and heals rather than dying to the return damage. The regeneration shield covers your creature against that return blow, so a body that would normally die in the trade walks away. Granting deathtouch is the cleaner half: regeneration alone saves a creature, but pairing it with a lethal-on-touch grant means the saved body also kills whatever it meets, so the card rarely sits as a pure blank even when the shield never fires. The price of that efficiency is a creature already in play and a reason to protect or arm it; there is no board impact on its own. It also functions away from combat, cast purely as a regeneration shield to beat a removal spell. The hook is the doubling-up: it answers removal and wins blocks in the same breath, a two-job instant priced for one.