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[3] Once per turn (Quick Effect): You can banish this card and all cards on your opponent's field and in their GY, then you can Special Summon 1 "Red Nova Dragon" from your Extra Deck (this is treated as a Synchro Summon)

You can banish this card from your GY, then target 1 "Time Thief" Xyz Monster you control

There is one drawback, though

Red-Eyes Darkness Metal Dragon's effect special summons any Dragon from the hand or graveyard with zero restriction, resulting in otherwise big monsters being summoned for free

You can only Special Summon "Spiritual Beast Rampengu(s)" once per turn

Leo ends up dying from the damage, but Ancient Fairy Dragon explains that she needs him to protect Luna and revives him through the effect of "Morphtronic Lantron"