Kodorrog, the Shredding

Whenever a nontoken creature attacks you or a planeswalker you control, turn it face down.
(It's a 2/2 creature.)
Whenever Kodorrog, the Shredding attacks,
reveal the top card of your library. If the revealed
card is a creature card, manifest that card.
Otherwise, put the revealed card into your
graveyard, and destroy target face down creature
you don't control.