Blood on the Snow is a rare Snow Sorcery card from Magic Online Promos (PRM), collector number 88284.
Choose one — • Destroy all creatures. • Destroy all planeswalkers. Then return a creature or planeswalker card with mana value X or less from your graveyard to the battlefield, where X is the amount of {S} spent to cast this spell. ({S} is mana from a snow source.)