Velociraptor

Vigilance
When Velociraptor attacks, you may pay {r}{r}. Velociraptor gets +4/+4.
If you have Tyrannosaurus Rex on the battlefield, Velociraptor gets hexproof until end of turn.
If you have Tyrannosaurus Rex on the battlefield, search your library or graveyard for Indominous Rex, Mutation. Put it in your hand.