Billie, the Binding Storm

Lifelink
Binding Storm — {2}{p/u}: Exchange this creature
with another creature with this ability that you
own outside the game.
Merge — {3}{p/u}{p/b}, {t}: Choose a creature you own outside the game with the Binding Storm ability
as a second commander and it has Lifelink.
"A violent storm of blood defiantly blockading the
space between life's gritty chaos and an indifferent
cosmic scale; an ever-shifting beast leering through the
void and devouring its past lives.