Arbu, Symbiosis Paragon

Arbu, Symbiosis Paragon enters the battlefield
with seven +1/+1 counters on it.
Whenever you sacrifice a nontoken creature,
exile it. Then you may pay X life and remove
X +1/+1 counters from Arbu, where X is less
than or equal to the number of cards exiled with
Arbu. If you do, for each of X target cards exiled
with Arbu, create a token that's a copy of that
card, except it's a 1/1 green Saproling creature
in addition to its other types.