Donon, Wildland Healer

{t}: Gain 1 life for each elf on the battlefield.
If any source controlled by an opponent causes Donon, Wildland Healer to leave the battlefield; exile Donon and then return him to the battlefield transformed under his owner's control.
Donon had roamed Calohar's woods; a lone wanderer and healer. Never had he harmed another. Yet harm came to him, and he felt fire and ice in his veins; the planes invading his soul.