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Gladiator Beast Bestiari and Gladiator Beast Murmillo give Mattern access to destruction effects, while Gladiator Beast Secutor and Gladiator Beast Darius give him access to quick, game-winning plays

Mana dorks like Ignoble Hierarch and Palladium Myr are perfect additions to this build because they can be cast early in the game, act as your mana source to get your Jund commander on the field, and then be sacrificed during its ETB or attack abilities to make it stronger with +1/+1 counters

Chalice of the Void is an excellent card to have against Lurrus decks, which are traditionally stuffed with one-mana spells

In a deck that uses all three, you can get four additional cards that weren't in your hand after drawing for turn