Nanauatzin, The Final Sun

Trample, Reach, Vigilance, Menace
Whenever another dinosaur creature enters the battlefield, it fights another target creature.
If a non-Dinosaur creature dies, you may exile it instead. You may pay {x} to cast any creature
exiled by Nanauatzin, The Final Sun, where X is
the creature's converted mana cost. It enters as a Dinosaur in addition to its other types.