Untap target creature an opponent controls and gain control of it until end of turn. That creature gains haste until end of turn. When you lose control of the creature, tap it.
Whenever Sabertooth Cobra 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 before that step. (A player with ten or more poison counters loses the game.)
Buyback (You may pay an additional as you cast this spell. If you do, put this card into your hand as it resolves.)Tap target artifact, creature, or land.
Haste (This creature can attack and as soon as it comes under your control.)At the beginning of the end step, return Viashino Sandstalker to its owner's hand. (Return it only if it's on the battlefield.)