Precipice of the Fallen

{t}Precipice of the Fallen gives {x} red mana, in
which {x} is the amount of Dragons and Wyverns
in your graveyard. This ability can only be played
once each time a Dragon or Wyvern is brought
into your graveyard.
{t} Exile a Dragon or Wyvern from your
Graveyard. Search your deck for a Mountain
card and play it.