Zephyrak, the Whimscythe

+1: Put a feather counter on Zephyrak. Creatures you control with flying get +1/+1 for each feather counter on Zephyrak.
-2: Target creature becomes a Bird Frog with base power and toughness 1/3 and flying until your next turn.
-5: Choose two creatures. They fight each other. If at least one creature is destroyed this way, gain control of all creatures involved in the fight