Voltaic Key

Trample Whenever this creature is dealt damage, sacrifice that many permanents.

This creature can't block. Sacrifice a creature: Put a +1/+1 counter on this creature.

Flying B: This creature gets +1/+0 until end of turn. Activate no more than twice each turn.

T, Sacrifice this creature: Target creature gets -1/-1 until end of turn.

Flying Echo 2B (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.) When this creature enters, destroy target nonartifact, nonblack creature.

Sacrifice a creature: This creature gets +2/+2 until end of turn.

When this creature enters, add BBB.

1, Sacrifice a creature: Put a +1/+1 counter on this creature.