Stalking Yeti [Coldsnap] Nightmare Horror that player sacrifices that creature

that player sacrifices that creature unless they pay {2}

Set: Future Sight Type: Land Rarity: Uncommon Keldon Megaliths enters the battlefield tapped

Set: Commander 2017 Type: Legendary Creature — Human Wizard Rarity: Rare Cost: {2}{U}{U}{U} Tap an untapped Wizard you control: Draw a card

Set: Kaladesh Type: Sorcery Rarity: Common Cost: {1}{G} Target creature gets +4/+4 and gains trample until end of turn

Stalking Yeti [Coldsnap] Nightmare Horror that player sacrifices that creatureSet: Coldsnap Type: Snow Creature Yeti Rarity: Uncommon Cost: {2}{R}{R} When Stalking Yeti enters the battlefield, if it's on the battlefield, it deals damage equal to its power to target creature an opponent controls and that creature deals damage equal to its power to Stalking Yeti. {2}{S}: Return Stalking Yeti to its owner's hand. Activate only as a sorcery. ({S} can be paid with one mana from a snow source.)