Saltu, Dragonborne Forcemage

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 Saltu, Dragonborne Forcemage is
paired with another creature, each of those
creatures gets +2/+2 and Vigilance.
Partner (You may have two commanders if both
have partner.