Criatura artefacto — Constructo lobo
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El Prototipo lupino no puede atacar ni bloquear a menos que un jugador no tenga cartas en su mano.
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.