Yitta, Shepherd of Dynamicity

Soulbond with creatures of your conduit color
As long as Yitta is paired with another creature,
both have indestructible and reach.
When Yitta enters the battlefield, for each green
mana spent to cast it, destroy target creature
token. For each token destroyed this way, search
your library for a creature card with equal power
or toughness to it, put it onto the battlefield,
then shuffle.