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Siempre que lances un hechizo que no sea criatura, si se usaron al menos cuatro manás para lanzarlo, pon un contador +1/+1 sobre esta criatura y no puede ser bloqueada este turno.
Sahagin's ability resolves before the spell that caused it to trigger. It resolves even if that spell is countered or otherwise leaves the stack.
Once Sahagin has been blocked, casting a noncreature spell in order to cause Sahagin's ability to trigger won't cause Sahagin to become unblocked.