Mana Vault [Ultimate Masters] Nightmare Horse Memnarch understands

Memnarch understands

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

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

Set: Legions Type: Creature — Insect Rarity: Rare Cost: {1}{R}{R}{R} Haste

Mana Vault [Ultimate Masters] Nightmare Horse Memnarch understandsSet: 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}.