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Given how there was no magic in SAO, I doubt there was self-destruct magic in SAO--assuming the topic is the game SAO, and not the anime/franchise SAO.
That said there are ways to sacrifice yourself to ensure a victory--mainly by letting an enemy stab you and using that moment while their blade is stuck in you to attack. Just like Kirito did to Heathcliff... though doing so before your HP runs out and intentionally.
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