For example, if you control Traveling Chocobo ("You may play lands and cast Bird spells from the top of your library.") and Jidoor, Aristocratic Capital is on top of your library, you can play Jidoor, Aristocratic Capital, but you can't cast Overture
Not to mention that outlast offers Commander players access to placing counters as a mana sink and special abilities that they can grant to every creature with +1/+1 counters on them
We've previously had a peek at both Commanders' abilities, which make great use of Midnight Hunt's new Coven and Decay mechanics
So your deck is effectively 99 cards (98 with partner commanders) since your commander sits in the command zone during the whole game
Creature (24) Ascendant Packleader Creepy Puppeteer Flourishing Hunter x2 High-Rise Sawjack x3 Lambholt Harrier x3 Mounted Dreadknight x3 Spore Crawler x3 Thundering Raiju Timberland Guide x4 Topiary Stomper Voldaren Stinger x2 Instant (8) Abrade x3 Burn the Accursed x2 Witch's Web x3 Enchantment (1) Land (27) Forest x11 Mountain x12 Rugged Highland x4 Its not as well constructed as some of the previous decks, and this Gruul deck probably wont do too well with the somewhat jumbled theme of the deck, but it gives players a starting place to build on
As with Modern, one of the defining elements of both of the Eternal Formats comes as a result of its lands