"Madness can't touch a mind ignited by genius."

Thermo-Alchemist

Defender
{T}: Thermo-Alchemist deals 1 damage to each opponent.
Whenever you cast an instant or sorcery spell, untap Thermo-Alchemist.

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Jumpstart 2022

In a Two-Headed Giant game, Thermo-Alchemist's activated ability causes the opposing team to lose 2 life.

Thermo-Alchemist's triggered ability resolves before the spell that caused it to trigger. It resolves even if that spell is countered. Players can cast spells and activate abilities (such as Thermo-Alchemist's own activated ability) after the triggered ability resolves but before the spell that caused it to trigger does.