Traveling Chocobo lets you look at the top card of your library whenever you want (with one restrictionsee below), even if you don't have priority
Evaluating and swapping packages rather than single cards keeps the deck coherent and makes upgrades or pivots (like moving toward cEDH) far easier
Coming down as a hasty 5/5 for means you can deal some damage right away, but its the random options that can truly swing a game: putting three +1/+1 counters on target creature, putting a shield counter on target creature and gaining three life, or fighting another target creature a foe controls
Locations might prevent characters from being challenged, bolster their stats, and way more besides
The presentation also confirmed that if you get a themed Magic Commander Deck, say like the one for Final Fantasy VI, it will pretty much only contain cards based on characters, enemies, and concepts from that installment