Cosmic Cube
Artifact
Oracle Text
Ward
Whenever you attack, look at the top six cards of your library. You may cast a spell from among them with mana value less than or equal to the greatest power among attacking creatures you control without paying its mana cost. Put the rest on the bottom of your library in a random order.
Rules for this card
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A triggered ability that can counter spells or abilities that target the permanent with ward. See rule 702.21, “Ward.”