Buta, Irreversible Savage

Whenever a creature dies, its controller may
choose a card type then reveal the top 3 cards of
their library and put all of the cards of that type
in their hand and the rest in the graveyard.
{1}{r}{g}, Sacrifice a creature: Buta deals damage
equal to that creatures power to any player.
Buta, Irreversible Savage's power is equal to
the greatest power of a creature that has died
this turn