Gemstone Caverns [Time Spiral] Revised Edition defending player reveals the top

defending player reveals the top card of their library

Set: Ravnica: City of Guilds Type: Artifact Rare Cost: {3} Whenever a nonartifact permanent enters the battlefield under your control

Set: Limited Edition Beta Type: Land — Forest Plains Rare Cost: ({T}: Add {G} or {W}

Set: Asia Pacific Land Program Type: Basic Land — Island Common Cost: ({T}: Add {U}

then draw seven cards

Gemstone Caverns [Time Spiral] Revised Edition defending player reveals the topSet: Time Spiral Type: Legendary Land Rare Cost: If Gemstone Caverns is in your opening hand and you're not playing first, 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.