Cavern of Souls [The List] Advent Calendar 2018 and only if you control

and only if you control no face-up Synchro Monsters

Set: Stardust Overdrive Card type: Synchro/Effect Monster Rarity: Ultimate Rare Attack: 3800 Defense: 3000 "Majestic Dragon" + "Stardust Dragon" + 1 non-Tuner monster You can Tribute this card to negate the activation of an opponent's Spell Card

Set: Aether Revolt Prerelease Promos Type: Enchantment — Aura Rarity: Mythic Cost: {2}{U}{U} Enchant artifact you control

then draw a card

Set: Starstrike Blast Card type: Normal Trap Rarity: Common Select 1 Level 4 or lower "Watt" monster in your Graveyard

Cavern of Souls [The List] Advent Calendar 2018 and only if you controlSet: The List Type: Land Rarity: Rare As Cavern of Souls enters the battlefield, choose a creature type. {T}: Add {C}. {T}: Add one mana of any color. Spend this mana only to cast a creature spell of the chosen type, and that spell can't be countered.