Gruumsh, the Primal Roar

Gruumsh costs {x} less to cast, where X is the
total power of creatures that died this turn.
The creature with the highest power among
creatures has trample, and "Sacrifice a creature:
This creature gets +1/+0 until end of turn."
{2}{b}{r}{g}, Exile a creature card from your
graveyard: Put X +1/+1 counters on target
creature, where X is the exiled card's power.