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Finally, you can pay three loyalty to tap X creatures you control to have a permanent your opponent controls with mana value X or less be shuffled back into their deck

Even decks built around black Auras in MTG can make use of it with the right setup

The significance of being Signers is denied by several of the group, but it is revealed that their signature dragon cards are each keys that can be used to shut down the towers in the B.A.D

Reshiram & Zekrom GX: The art, though

These will later be updated in subsequent playtest cards

This Partner, but not Partner mechanic felt like a fresh and exciting new approach to Commander, and a great way to make fun new combinations