Credit to Wynn for coming up with the idea (of course). I tweaked it a bit but am willing to test for further tweaking.
Monsters:
3x Gusto Gulldo
3x Gusto Egul
3x Winda, Priestess of Gusto
1x Caam, Serenity of Gusto
1x Kamui, Hope of Gusto
1x Gladiator Beast Bestiari
2x Gladiator Beast Darius
2x Gladiator Beast Laquari
2x Gladiator Beast Equeste
1x Gladiator Beast Murmillo
1x Gladiator Beast Retiari
1x Gladiator Beast Hoplomus
3x Test Tiger
Spells:
2x Forbidden Lance
2x Infected Mail
1x Monster Reborn
1x Dark Hole
1x Book of Moon
1x Pot of Avarice
1x Contact with Gusto
1x Gladiator Beast's Respite
1x Heavy Storm
Traps:
2x Gladiator Beast War Chariot
2x Mirror Force
1x Call of the Haunted
1x Dimensional Prison
1x Solemn Warning
1x Starlight Road
Extra:
1x Gladiator Beast Essedarii
1x Gladiator Beast Gyzarus
1x Gladiator Beast Heraklinos
1x Daigusto Gulldos
1x Daigusto Sphreez
1x Number 39: Utopia
1x Number C39: Utopia Ray
1x Ally of Justice Catastor
1x Vulcan the Divine
1x Lavalval Chain
1x Daigusto Emeral
1x Black Rose Dragon
1x Scrap Dragon
1x Maestroke the Symphony Djinn
1x Stardust Dragon
This was VERY hard to do, btw. Gladiator Beasts and Gustos have almost completely different playstyles, and while the originality of this deck is beyond human comprehension, there might be a reason for that
Thoughts?