Chemister's Trick is a common Instant card from Return to Ravnica (RTR), collector number 149. Current market price: $0.10 (foil $0.40), TCGplayer market prices via Scryfall.
Target creature you don't control gets -2/-0 until end of turn and attacks this turn if able. Overload {3}{U}{R} (You may cast this spell for its overload cost. If you do, change "target" in its text to "each.")