Mana Caverns

If Mana Caverns is in your opening hand and
you're not playing first, you may begin the game
with Mana Caverns on the battlefield with a luck counter on it. If you do, exile a card from your
hand.
{t}: Add one mana of any color. If Mana Caverns
has a luck counter on it, instead add two mana
of any color.