spirit absorber taveera

when this creature enters the battlefield,
each opponent gets a 1/1 white spirit token
for the amount of mana spent to cast this spell
{t}:taveera deals 1 damage to target creature.
if a spirit is destroyed and it wasn't under
your control create a 1/1 green saproling creature token,
then creatures you control get +1/+0
until end of turn