Helfi, the Hunter

+1: Helfi, the Hunter becomes a X/X legendary creature were X is equal to her loyalty until end of turn. You may have her fight target creature.
0: Helfi, the Hunter becomes a 5/5 legendary creature with trample until end of turn. You gain 3 life.
-7: Halfi, the Hunter becomes a 7/7 legendary creature, "At the beginning of your upkeep, this card fights target creature you don't control.