Gemstone Caverns (274) [Time Spiral] Champs and States you may have this creature

you may have this creature become a copy of another target creature until end of turn

If those permanents are exchanged this way

Set: Commander 2015 Type: Creature — Elemental Rarity: rare Cost: {4}{G}{G} When this creature enters

Sacrifice after VI

you may cast up to one target card of the other type from your graveyard

Gemstone Caverns (274) [Time Spiral] Champs and States you may have this creatureSet: Time Spiral Type: Legendary Land Rarity: rare If this card 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.