Card: Gemstone Caverns
Casting Cost:
Color: Green
Type: Legendary Land
Rules Text: 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 {1} to your mana pool. If Gemstone Caverns has a luck counter on it, instead add one mana of any color to your mana pool.

SetRarity
Time SpiralRare