Gemstone Caverns

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.

Thorn of Amethyst

Noncreature spells cost {1} more to cast.

City of Traitors

When you play another land, sacrifice this land.
{T}: Add {C}{C}.

Silence

Your opponents can't cast spells this turn.