Goblin Cannibal

Bloodsoak — When Goblin Cannibal
enters the battlefield, you may sacrifice a
creature. If you do, put a number of +1/+1
counters on it equal to the power of the sacrificed creature, then this creature gains haste until end
of turn.
When Goblin Cannibal attacks, if it has power 6
or greater, creatures you control get +2/+0 until
end of turn.