If you Special Summon this card with the effect of "Flamvell Firedog", you can change its Level with its own effect in order to Synchro Summon any Synchro Monster from Level 5 to 11 that does not require specific Materials.
You can use the effect of this card to send a Level 7 or lower "Infernoid" monster from your Deck to your Graveyard, and then Special Summon another "Infernoid" monster whose Level matches this card's new Level for a quick 2 Material Xyz Summon. If the "Infernoid" monster you sent by the effect of this card was Level 4-7, you can alternatively Special Summon "Ultimaya Tzolkin". The "Infernoid" archetype's reliance on "Void" Spell and Trap Cards would help in triggering the effect of "Ultimaya Tzolkin".
You can use "Void Purification" to retrieve the "Infernoid" monsters you sent from your Deck to your Graveyard with the effect of this card.