Lavaborn Tiger

First strike, animosity (This creature is dealt damage in the form of +1/-1 counters.)
Morph - {r}, Sacrifice a mountain (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)
Lava is flowing in its vein. The more it bleeds, the more ferocious it gets.