Smelt-Ward Minotaur’s triggered ability resolves before the spell that caused it to trigger. It resolves even if that spell is countered.
Whenever you cast an instant or sorcery spell, target creature an opponent controls can't block this turn.
Resolving Smelt-Ward Minotaur’s triggered ability after a creature has blocked won’t remove the blocking creature from combat or cause the creature it blocked to become unblocked.
