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While Im generally loathe to recommend Reserved List cards, Peacekeeper is one of the more reasonably priced examples and can be used to keep opponents from attacking while you recur it during the end step

Rarity : Mythic Rare Cost : 5GG Colour Identity : Green Usage : Serves as a game-ending threat when you have a critical mass of creatures on the battlefield

Aether Revolt have different takes on typical mono-colored abilities, from Yahenni, Undying Partisan's indestructible sacrifice to Baral, Chief of Compliance combining the looting ability to draw and discard with the instant and sorcery loving of a control deck

Well once again want ways to make it unblockable