Graviton Backup

{{CardTable2 }}{{Graviton}}{{LHK}}
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 * attribute = Spell
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 * sets = Limit Break of the Duelist
 * rarity = Rare
 * typest = Normal
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 * lore = Tribute 1 "[{Graviton]]" Xyz Monster you control; Special Summon "Graviton" monsters, depending on the Rank of the tributed monster. You can only activate 1 "Graviton Backup" per turn. ● 4: 1 "Graviton" monster from your Graveyard and 1 from the hand. ● 8: 2 "Graviton" monsters from the hand or Graveyard.