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Whenever two or more creatures you control attack a player, look at the top five cards of your library. You may reveal a creature card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.
In a multiplayer game, Horn of the Mark's triggered ability triggers once for each player you attack with at least two creatures.
Two or more creatures you control must attack the same player in order for Horn of the Mark's ability to trigger. Creatures you control that attack planeswalkers that player controls or battles that player is protecting won't count toward Horn of the Mark's trigger condition.
