Mana Vault [Ultimate Masters] Nightmare Horse Set: Seventh Edition Type: Sorcery

Set: Seventh Edition Type: Sorcery Rarity: Rare Cost: {2}{R}{R} Untap all creatures that attacked this turn

Memnarch understands

Set: Unhinged Type: Basic Land — Swamp Rarity: Common ({T}: Add {B}

Set: Portal Three Kingdoms Type: Sorcery Rarity: Rare Cost: {1}{G} Tap any number of untapped creatures you control

Set: Ultimate Masters Box Topper Type: Legendary Creature — Eldrazi Rarity: Mythic Cost: {15} This spell can't be countered

Mana Vault [Ultimate Masters] Nightmare Horse Set: Seventh Edition Type: SorcerySet: Ultimate Masters Type: Artifact Rarity: Mythic Cost: {1} Mana Vault doesn't untap during your untap step. At the beginning of your upkeep, you may pay {4}. If you do, untap Mana Vault. At the beginning of your draw step, if Mana Vault is tapped, it deals 1 damage to you. {T}: Add {C}{C}{C}.