Selvara, Will of the Faewild

Whenever you tap a land for mana, add one
mana of any type that land produced.
{x}{u}{r}{g},{t}, Reveal the top X cards of your
library. You may put any number of permanent
cards with converted mana cost X or less from
among them onto the battlefield. Then put all
cards revealed this way that weren't put
onto the battlefield into the your graveyard.