Dispersing Essence

Soulbond (You may pair this card with another
unpaired creature when either enters the battlefield.
They remain paired for as long as you control both of
them.)
As long as Dispersing Essence is paired with a creature, that creatures has "{2}{u}, {t}: Return
this creature to its owner's hand, then put X 1/1
blue Butterfly Spirit tokens with flying onto the battlefield, where X equals this card's converted
mana cost."