You can Ritual Summon this card with “Contract with the Abyss”.
(1) This card’s name is treated as “Summoned Skull” while it is in the Monster Zone.
(2) This card on the field cannot be destroyed by battle with non-Ritual Monsters, and cannot be destroyed by the monster effects of non-Ritual Monsters.
(3) If this Ritual Summoned card in its owner’s possession is sent to the GY by an opponent’s card (by battle or card effect, or by being destroyed): You can Special Summon 1 “Summoned Skull” from your hand, Deck, or GY.