Blood-Fuelled Tracer

Gift {s} ({s}: This creature fights target creature you don't control.)
Lurk {b}{b} ({b}{b}: Turn this card face down. While face down it is a 3/3 creature with no color and no creature type. Turn it face up at any time by discarding a card.)
When this card is flipped face up it gains lifelink and you add {s} to your mana pool.