Molten-Core Maestro (SOS 335)

Creature — Goblin Bard • Mana cost: {1}{R} • Secrets of Strixhaven • Rare

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."

Illustrated by Aleksi Briclot.