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 this creature enters, 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.