Viashino Tonic Brewer

Convoke (Your creatures can help cast this spell.
Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.)
When Viashino Tonic Brewer enters the battlefield, you may put a -1/-1 counter on any
number of target tapped creatures you control. If
you do, distribute that many +1/+1 counters
among any number of target untapped creatures.