Fanyana, The Soulmate

Soulbound (You may pair this creature with another
unpaired creature when either enters the battlefield.
They remain paired for as long as you control both
of them.)
As long as Fanyana, the Soulbinder is paired with another creature, each of those creatures has
+0/+2, vigilance, lifelink and "Whenever this
creature is target of a spell or ability, you may
change the target or copy it to other creature
paired with this creature."