Lephantis, The Assimilator

As Lephantis enters the battlefield, sacrifice
3 creatures. If they don't share a creature
type, put X +1/+1 counters on Lephantis, where X is the combined converted mana
cost of those creatures.
Ferocious - As long as creatures you control
have a total power of 8 or greater, Lephantis
has menace and vigilance.