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Try using it together with "Elemental HERO Heat" which has an effect that raises its ATK by 200 points for every Elemental Hero on your side of the field

"Counter Gate" resolves and Kaiba draws (from the ground rather than the Deck) "Obelisk the Tormentor"

Return another target nonland permanent to its owner's hand

You can then summon the Xyz monster from your Extra Deck, with a Rank equal to those monsters Level (example: A Rank 4 monster for two or more Level 4 monsters), placing the monsters used for its summon underneath the Xyz monster as Xyz Materials

Marneus will trigger when one or more tokens enters the battlefield