You can only use the (1)st and (2)nd effects of this card’s name each once per turn, and cannot activate more than 1 in the same Chain.
(1) If a non-Ritual Monster(s) you control is destroyed by battle or effect: You can Special Summon 1 “Skull Guardian” from your hand or Deck.
(2) You can send this face-up card to the GY, then target 1 Ritual Monster you control; it gains ATK equal to the total original ATK of all other face-up monsters currently on the field, until the end of this turn.