Molten-Core Maestro (#335)

Type: Creature — Goblin Bard

Text: Menace
Opus — Whenever you cast an instant or sorcery spell, put a +1/+1 counter on this creature. If five or more mana was spent to cast that spell, add an amount of {R} equal to this creature's power.

"My media? Fury and flame."

Set: Secrets of Strixhaven (#335)