Battles of Legend: Monster Mayhem is an all-foil Yu-Gi-Oh! TCG booster box built around variant arts and foil upgrades. The 177 card set adds support for several established Deck themes alongside foil versions of long-running favorites.

• Set: Battles of Legend: Monster Mayhem, 1st Edition
• Set size: 177 cards, all foil
• Configuration: 24 packs per box
• Chase cards: 10 chibi variant art cards, emblazoned Dragonmaid, P.U.N.K. and Orcust Ultra Rares, plus returning Starlight Rares
• New support: Nekroz, Gem-Knight, Jurrac, Fabled, D/D and Magistus

Also available as a sealed case of 12 units.