You can only use this card name’s (2) effect once per turn.
(1) Fusion Summon 1 “Fossil” Fusion Monster from your Extra Deck, by banishing monsters from either GY as material. If you banished monsters from both GYs with this effect, the Special Summoned monster cannot be targeted by monster effects.
(2) If a face-up “Fossil” Fusion Monster you control is destroyed by battle or card effect and this card is in your GY: You can add this card from your GY to your hand.