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Mage-Ring Responder doesn't untap during your untap step.: Untap Mage-Ring Responder.Whenever Mage-Ring Responder attacks, it deals 7 damage to target creature defending player controls.
This creature is insane. Dealing 7 extra damage to a creature of your choice is great. And for 7 mana it has vigilance. Did anyone say lifelink-combo?