Sabertooth Cobra is a common Creature — Snake card from Mirage (MIR), collector number 238. Current market price: $0.14, TCGplayer market prices via Scryfall.
Whenever this creature deals damage to a player, that player gets a poison counter. The player gets another poison counter at the beginning of their next upkeep unless they pay {2} before that step. (A player with ten or more poison counters loses the game.)