Cobra Trap is a uncommon Instant — Trap card from Commander 2011 (CMD), collector number 146. Current market price: $0.20, TCGplayer market prices via Scryfall.
If a noncreature permanent under your control was destroyed this turn by a spell or ability an opponent controlled, you may pay {G} rather than pay this spell's mana cost. Create four 1/1 green Snake creature tokens.