yugioh machine structure deck YU-GI-OH REACTOR Machina Mayhem includes The Big Saturn from the Yu Yu Gi Oh! - Structure

same with Paladin Danse, Steel Maverick

Also a Brutal Bonus Level, as these opponents start with at least 30,000 LP and won't hesitate to cheat

Or all of them

I think you could focus a bit more on the secondary theme of Hallar, which is +1/+1 counters

each 100-card deck contains 2 Foil Legendary Creature cards and 98 nonfoil cards MAGIC MEETS THE LORD OF THE RINGSExperience the beloved story of The Lord of the Rings with the strategic gameplay of Magic: The Gathering, facing off against opponents in thrilling magical battles EPIC MULTIPLAYER BATTLESCommander is a multiplayer way to play Magic, an epic, free-for-all battle full of strategic plays and social intrigue INTRODUCING 80 COMMANDER CARDSEach deck introduces 20 never-before-seen Commander cards to Magic: The Gathering COLLECT SPECIAL TREATMENT CARDSEach deck comes with a 2-card Collector Booster Sample Pack containing 2 special treatment cards from The Lord of the Rings: Tales of Middle-earth set, including 1 Rare or Mythic Rare and at least 1 Traditional Foil EVERYTHING YOU NEED TO PLAY AND MOREEach deck also comes with 10 double-sided tokens, 1 Helper card, 1 life tracker, 1 deck box, and 1 Foil-Etched Display Commander Reimagine your favorite characters with this favorite multiplayer Magic format