Janna, Treetop Stalker

Hexproof, defender
As long as Janna has reach she loses hexproof and gains "{t}: This creature fights target creature with flying. If that creature dies this turn, untap this creature.
Ballistic 2 {g}{g} ({g}{g}: This creature gets +2/+2 and gains reach until end of turn. Activate only once each turn.)
She is as swift as the arrows she shoots.