Winged Menace

Multikicker {b} (You may pay an additional {b} any number of times as you cast this spell.)
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.)
Create a 1/1 black Bat creature token with flying. Repeat this process for each time Winged Menace was kicked.