Zahel, Unusual Ardent

Lifelink

Whenever an Aura you control becomes attached to a nonland permanent and opponent controls with mana value less than or equal to that Aura's mana value, gain control of that permanent for as long as that Aura is attached to it.

It was Zahel who provided Gavilar with the sphere of anti-Voidlight that would pass on to Szeth after he assassinated the king.

based on Eriette, the Beguiler