Reverse Beartrap

Unequip: Sacrifice creature with power and toughness greater than the power of the equipped creature.

2+X: Attach to target creature an opponent controls, X equals the base toughness of target creature.

When the equipped creature taps, put a Timer counter on Reverse Beartrap. When Reverse Beartrap reaches 3 Timer counters, sacrifice the equipped creature, and the player
who controls the sacrificed creature gets Poison counters equal to that creatures power and toughness.