Stiva, the Lover

Stiva, the Lover costs {x} less, where {x}
is equal to the number of creatures on the battlefield.
Stiva's power and thoughness are equal
to the number of enchantments on the battlefield
Whenever a enchantment you control enchants a creature, you gain control of that creature if it's thoughness is lower than Stiva's.
When Stiva, the Lover enters the battlefield, Ascend.
—"ta comigo?"