The ability that defines Lord of Extinctionâ€™s power and toughness works in all zones, not just the battlefield. If Lord of Extinction is in your graveyard, it will count itself.
If an instant or sorcery spell deals damage to Lord of Extinction or lowers its toughness, that spell is put into its ownerâ€™s graveyard before state-based actions are performed. That card will raise Lord of Extinctionâ€™s toughness before the game checks to see if it dies.
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