Time Vault [International Collectors' Edition] SM236 you may begin the game

you may begin the game with Gemstone Caverns on the battlefield with a luck counter on it

−2: You may reveal an artifact card you own from outside the game or choose a face-up artifact card you own in exile

Set: Sword & Shield: Brilliant Stars Type: Supporter Rarity: Promo

After this

Time Vault [International Collectors' Edition] SM236 you may begin the gameSet: International Collectors' Edition Type: Artifact Rarity: Rare Cost: {2} Time Vault enters the battlefield tapped. Time Vault doesn't untap during your untap step. If you would begin your turn while Time Vault is tapped, you may skip that turn instead. If you do, untap Time Vault. {T}: Take an extra turn after this one.