Sophie, Ardent Companion

Soulbond (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 Sophie, Ardent Companion is paired
with another creature, both creatures have
lifelink, hexproof, and {w}: Regenerate.
"Some may desert you, sun turn to fog; but you're
never alone, if you have a dog."