Roilmage's Trick

Instant

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Oracle text:

Converge — Creatures your opponents control get -X/-0 until end of turn, where X is the number of colors of mana spent to cast this spell.
Draw a card.

Weather on Zendikar is unpredictable—unless you're the one telling it what to do.

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Collection:

Battle for Zendikar

Rarity:

Common