Mana Vault [Kaladesh Inventions] Kaladesh Prerelease Promos but my host would casually

but my host would casually push it down before I could make out what it was

Set: Arabian Nights Type: Creature — Djinn Rarity: Rare Cost: {2}{U}{U} Flying

When Necromancy leaves the battlefield

Set: Tempest Type: Artifact Rarity: Rare Cost: {2} Blue spells you cast cost {1} less to cast

Mana Vault [Kaladesh Inventions] Kaladesh Prerelease Promos but my host would casuallySet: Kaladesh Inventions 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}.