Use the two cards sent to your Graveyard by "Laval Miller", or for the Synchro Summon of this card, to use its effect.
If you Summon a "Lava Golem" to your opponent's side of the field and then use this card's effect, your opponent's field can be cleared easily.
Another possible combo with this card is to add "Degenerate Circuit", banishing whatever card you return to the hand instead.
Use this card to shuffle the monsters summoned by "Rekindling" to avoid banishing them.
In a Laval deck, after playing "Rekindling" while having the necessary components to make "Shooting Quasar Dragon" in your Graveyard, you can use this card's effect to return any threats your opponent has to their hand in the middle of making Quasar, then attack twice with Quasar for an automatic win (assuming your opponent had not gained any Life Points).