Card: Chant of Vitu-Ghazi
Casting Cost: 6WW
Color: Red
Type: Instant
Rules Text: Convoke (Each creature you tap while casting this spell reduces its cost by {1} or by one mana of that creature's color.) Prevent all damage that would be dealt by creatures this turn. You gain life equal to the damage prevented this way.

Ravnica: City of GuildsUncommon