Nanauatzin, The Final Sun

Trample, Reach, Vigilance
Whenever another non-token Dinosaur creature
enters the battlefield, it fights another target
creature.
If a creature dies by damage dealt from a dinosaur creature you control, you may exile it at the end
of the turn. You may pay {x} to cast a creature
exiled by Nanauatzin, The Final Sun, where X is
the converted mana cost. If a creature cast this
way dies, return it to its owner's graveyard.