Mana Doubler

Multiplies the mana your lands or permanents produce, so every land you already control starts making more. Mirari's Wake, Caged Sun. Read the wording before you add one, because some are a trap. Mana Flare, Heartbeat of Spring and Zhur-Taa Ancient say "a player", so every opponent's lands make extra mana too, and each of them gets to spend it before your next turn. Nikya of the Old Ways doubles only your own lands, but it stops you casting anything that is not a creature.

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