Gemstone Caverns [Time Spiral] Urza's Saga At the beginning of each

At the beginning of each end step

exile X creature cards from your graveyard

Set: From the Vault: Relics Type: Legendary Artifact Creature — Golem Rarity: Mythic Cost: {5} Whenever Karn

double strike

Set: Portal Three Kingdoms Type: Sorcery Rarity: Uncommon Cost: {W} Target opponent skips all combat phases of their next turn

Gemstone Caverns [Time Spiral] Urza's Saga At the beginning of eachSet: Time Spiral Type: Legendary Land Rarity: Rare If Gemstone Caverns is in your opening hand and you're not the starting player, you may begin the game with Gemstone Caverns on the battlefield with a luck counter on it. If you do, exile a card from your hand. {T}: Add {C}. If Gemstone Caverns has a luck counter on it, instead add one mana of any color.