Dreadmaw, The Colossal

Trample
At the beginning of combat on your turn,
you may choose a creature you control. That
creature had base power and toughness 6/6,
loses all abilities, gains trample, has a converted
mana cost of 6, loses all colors, becomes green,
becomes a dinosaur, loses all other creature types,
and is named Colossal Dreadmaw until end of
turn.