
Creature — Goblin Bard
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 equal to this creature's power.
2/2
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→ Infinite +1/+1 counters on a creature, Infinite copies of the casted instant or sorcery, Infinite magecraft triggers
→ Infinite +1/+1 counters on a creature, Infinite damage, Infinite magecraft triggers
→ Infinite +1/+1 counters on a creature, Infinite ETB, Infinite LTB
→ Infinite +1/+1 counters on a creature, Infinite damage, Infinite magecraft triggers
→ Infinite red mana, Infinite storm count, Infinite +1/+1 counters on a creature
→ Infinite +1/+1 counters on a creature, Infinite ETB, Infinite colored mana
An opus ability resolves before the spell that caused it to trigger. It resolves even if that spell is countered or otherwise leaves the stack.
Molten-Core Maestro's last ability is not a mana ability. It uses the stack and can be responded to.