Beast Gear, known as Beast Machine World (獣(じゅう)機(き)界(かい) Jūkikai) in Japanese, is a series of Beast-Warrior Type monsters used by Yosh Imimi in the Yu-Gi-Oh! SEVENS anime and Juji in the Yu-Gi-Oh! Rush Duel LP manga. The series is supported by the Apocalypse series of Spell/Trap Cards, known as Post-Apocalyptic (世(せい)紀(き)末(まつ) Seikimatsu) in Japanese.
Ancient Gear Beast (BAM) - Yugipedia - Yu-Gi-Oh! wiki
Ancient Gear Golem (Duel Arena) - Yugipedia - Yu-Gi-Oh! wiki
Opti-Camouflage Armor - Yugipedia - Yu-Gi-Oh! wiki
Ignister, Yu-Gi-Oh! Wiki
Machine - Yugipedia - Yu-Gi-Oh! wiki