Artefaktkreatur — Wolf, Konstrukt
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Der Wolf-Prototyp kann nicht angreifen oder blocken, es sei denn, ein Spieler hat keine Karten auf der Hand.
If a creature can’t attack or block unless you return a permanent to your hand, and your hand is empty, you can attack or block with that creature and Lupine Prototype. This is because the legality of chosen attackers and blockers is checked before costs are paid.