Doors of Durin
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Porte di Durin (Doors of Durin) (it)

Legendary Artifact (CMC 5)
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.