Thrull Visionary

Morph {5} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)
For each counter on a permanent or player, Thrull Visionary's morph cost costs {1} less.
Whenever Thrull Visionary is turned face up, add {b}{b}{b}{r}. You may use this mana only to cast spells whose text contains one or more instances of the string "sacrifice".