This includes Metallurgeon, Poultice Sliver, Pteron Ghost, Vigilant Martyr, and Gore Vassal
It's best in a slower deck that uses energy, perhaps one with some self-bounce synergies
Gardevoir has proven staying power in the collector market
I like the idea of turning a mana rock into a creature after I've already used it for mana, but I'm sure you can come up with something more devious
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But now that Wizards of the Coasts printing methods are advanced enough to apply the acorn stamp, the company is just formalizing a design divide which has been obvious all the way back to 1998s Unglued