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Roilmage's Trick [Battle for Zendikar]

$1.22
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Set: Battle for Zendikar
Type: Instant
Rarity: Common
Cost: {3}{U}
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.