When a Fusion Monster summoned with this monster is destroyed by battle or card effect, you can use "Branch!" to special summon "Fusion Parasite" to the field. This way you could Fusion Summon again through its effect.
"One for One" can be used to easily trigger this card's effect.
During the Battle Phase, attack with a Fusion Monster that was Fusion Summoned using this card, then use "De-Fusion" to return it to the Extra Deck and Special Summon its Fusion Materials, including this card. Its effect will then activate, allowing you to Fusion Summon and attack with that Fusion Monster again.
With multiple copies of "De-Fusion" ready to activate, you can do this over and over again.