Roilmage's Trick is a common Instant card from Battle for Zendikar (BFZ), collector number 83. Current market price: $0.04 (foil $0.40), TCGplayer market prices via Scryfall.
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.