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To kick off the final three entries, we have the Vault X deck box

Five life and five mana for five cards is decent but it is inflexible and not a better tool than Skeletal Scrying, Necropotence, Necrology, Yawgmoth's Agenda or any of the top end alternatives really

It then made a celebrated return to the TCG during the current Scarlet & Violet era, where it's again being used on promo cards

They can be Synchro Summoned from the Extra Deck by sending 1 face-up Tuner monster and any number of face-up non-Tuner monsters from your field to the Graveyard, when the sum of all their Levels is exactly equal to the Level of the Synchro Monster