Ureni of the Unwritten - 9 M TDC Foil

Flying, trample
Whenever Ureni enters or attacks, look at the top eight cards of your library. You may put a Dragon creature card from among them onto the battlefield. Put the rest on the bottom of your library in a random order.

mythic
Legendary Creature — Spirit Dragon
From the Magic: The Gathering set Tarkir: Dragonstorm Commander.