Juju, the Face Sifter

Convoke Each creature you tap while casting this
spell pays for {1} or one mana of any of that creature's colors.
Juju, the Face Sifter enters the battlefield with
a number of +1/+1 counters equal to half the
mana used to pay for him, rounded up.
Sacrifice Juju, the Face Sifter: Search your
library for a creature card with converted mana
cost equal to Juju's power, put it onto the
battlefield, then shuffle your library.