diabolos yugioh deck Supreme Darkness Booster Box – Northwest Sportscards may be 1st or Unlimited Edition Structure Deck Lair of Darkness

However, since it's a card that's all about "Instant Fusion", I don't think it's likely that this card itself will be regulated

If a monster(s) is Special Summoned face-up from your GY (except during the Damage Step): You can target 1 of them

After it attacks, it can banish an additional Plant-type monster from the Graveyard to make a second attack, although its Attack Points will be cut in half until that turn ends

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The side deck is entirely for going second

"Constellar Sheratan" and "Constellar Zubeneschamali" can both add another "Constellar" monster from the Deck to the hand when Summoned to the field