Hideous Laughter is a uncommon Instant — Arcane card from Champions of Kamigawa (CHK), collector number 115. Current market price: $0.19 (foil $0.35), TCGplayer market prices via Scryfall.
All creatures get -2/-2 until end of turn. Splice onto Arcane {3}{B}{B} (As you cast an Arcane spell, you may reveal this card from your hand and pay its splice cost. If you do, add this card's effects to that spell.)