Mana Vault [Beta Edition] Southern Islands You can only use this

You can only use this effect of "D/D Savant Thomas" once per turn

Set: 2020 Tin of Lost Memories Card type: Link/Effect Monster Rarity: Ultra Rare Attack: 2000 2 WATER monsters You can target 1 WATER monster with 1500 or less ATK in your GY

But it will not go quietly

Set: Mercadian Masques Type: Land Rarity: Rare {T}: Add {C}

Mana Vault [Beta Edition] Southern Islands You can only use thisSet: Beta Edition Type: Artifact Rarity: Rare 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}.