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あなたがクリーチャーでない呪文1つを唱えるたび、それを唱えるために4点以上のマナが支払われていた場合、このクリーチャーの上に+1/+1カウンター1個を置く。このターン、これはブロックされない。
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.