Doors of Durin{3}{R}{G}
Legendary Artifact
Whenever you attack, scry 2, then you may reveal the top card of your library. If it's a creature card, put it onto the battlefield tapped and attacking. Until your next turn, it gains trample if you control a Dwarf and hexproof if you control an Elf.
"Speak, friend, and enter."
Artist: Marc Simonetti