Rotten Vale

{t}: Add {b} to your mana pool.
{t}{x}: Search your deck for an elder dragon with
converted mana cost of X, put that card onto
the battle field under your control, during the
end step of your next turn sacrifice that creature.
{t}{b}{b}, sacrifice a creature, sacrifice Rotten Vale: Search your deck for a black creature, reveal it
and put it into your hand.