Gemstone Caverns

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 colour.
"Lucker dog."