Dispersing Essence

Whenever a creature is returned to its owner's
hand, its owner puts X 1/1 blue Butterfly Spirit
tokens with flying onto the battlefield, where X
equals that card's converted mana cost.
{3}{u}: Return target creature to its owner's hand.
Activate this ability only any time you could cast
a sorcery.
"You can banish my body, but my soul lives on."