Ghalta, Primal Fury

Trample

This creature costs {x} less to cast, where X is the greatest power among creatures you control.

When this creature enters, create half X rounded down green 6/6 dinosaur creature tokens with trample named Colossal Dreadmaw, where X is the amount of mana spent to cast this creature.

Sacrifice all tokens you control at the beginning of your end step.