Cannot be Normal Summoned/Set. Must be Special Summoned (from your hand) by sending 3 "Cubic" monsters you control to the Graveyard, and cannot be Special Summoned by other ways. If Summoned this way, this card gains 3000 ATK. This card can make a second and third attack during each Battle Phase. If this card in your possession is sent to your Graveyard by your opponent's card (by battle or card effect): You can target up to 3 "Cubic" monsters in your Graveyard; Special Summon them, then you can add 1 "Cubic" card from your Deck or Graveyard to your hand.
My Cubic Deck List IRL
YuGiOh The Dark Side of Dimensions Movie Pack Secret Edition Card List with Pictures
Indiora Doom Volt the Cubic Emperor [MVP1-EN038] Ultra Rare
YGOrganization [20TH-C] “Cubic” Reprints
Buster Gundil the Cubic Behemoth, Yu-Gi-Oh! Wiki
Yu-Gi-Oh! - Buster Gundil the Cubic Behemoth (MVP1-ENG35) - The Dark Side of Dimensions Movie Pack Gold Edition - 1st Edition - Gold Rare : Toys & Games
Yu-Gi-Oh! Wiki - Buster Gundil the Cubic Behemoth
Yu-Gi-Oh! TCG Deck - Cubics by Torgin Mackinga
Buster Gundil the Cubic Behemoth - Yu-Gi-Oh! Card Database - YGOPRODeck
Yu-Gi-Oh! The Dark Side of Dimensions Movie Pack: Gold Edition : YuGiOh Card Prices
Yugioh Cubic Deck 45 Card SECRET RARE Karma Complte Budget Tournament Ready
He's Legend rank 5 using triple D deck VS. the cubic cards ;) : r/DuelLinks
Buster Gundil the Cubic Behemoth - Yu-Gi-Oh! Card Database - YGOPRODeck
Cubic Chaos vs Full Board Branded, Cubic Ranked Part 5
Buster Gundil the Cubic Behemoth [MVP1-ENS35] Secret Rare