Beastking of the Swamps
"You can substitute this card for any 1 Fusion-Material Monster. When you do this, the other Fusion-Material Monster(s) must be the correct one(s)."
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Elemental Hero Electrum
" "Elemental HERO Avian" + "Elemental HERO Burstinatrix" + "Elemental HERO Clayman" + "Elemental HERO Bubbleman" "
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My question: I can only use one Beastking of the Swamps per Fusion?