The advanced rulebook is where the training wheels come off a little prematurely
The differences are small and when I build with them, I consider them equipment first, that don't lose a full creature slot
Furthermore, if you or your play group are inexperienced drafters, a clear theme can help give clear ideas of possible deck ideas
I could list every new card I love - like Alice, Growing Girl, who lends the Support keyword to your other characters and gains four lore when you reach ten strength, or Sisu, Divine Water Dragon, who allows you to draw a new card every time you quest - but in general all of the new cards in Rise of the Floodborn feel like a shift in power and ability
But Wizards didnt take official responsibility for Commander just to turn around and tell players to make up the rules themselves

Abigale, Poet Laureate Absorbing Man Abyssal Harvester Activated Sleeper Adagia, Windswept Bastion Adorned Pouncer Adventurous Eater Altar Ibn-La'Ahad Altered Ego Angel of Sanctions Anikthea, Hand of Erebos Anointer Priest Applied Geometry Arboreal Alliance Arcane Artisan Arcane Heist Ardyn, the Usurper Arna Kennerd, Skycaptain Artificer Class Artisan of Forms Ashad, the Lone Cyberman Ashling's Command Ashling, the Limitless Assemble from Parts Assembly Hall Assimilation Aegis Aurora Shifter Auton Soldier Aven Initiate Aven Wind Guide Awaken the Maelstrom Back from the Brink Banshee of the Dread Choir Battle for Bretagard Benthic Anomaly Bifurcate Biowaste Blob Blade of Selves Blade of Shared Souls Blazing Firesinger Bloodforged Battle-Axe Blue Sun's Twilight Body Double Bramble Sovereign Brenard, Ginger Sculptor Brigid's Command Broodbirth Viper Brudiclad, Telchor Engineer Cabaretti Confluence Cackling Counterpart Cadric, Soul Kindler Calamity, Galloping Inferno Calix, Guided by Fate Call of the Nightwing Caller of the Pack Caller of the Untamed Callidus Assassin Campus Composer Caretaker's Talent Caught in a Parallel Universe Cemetery Puca Cephalid Facetaker Chameleon, Master of Disguise Champion of Wits Chandra, Flameshaper Cheerful Osteomancer Chrome Dome City of Death Clever Impersonator Clone Clone Legion Cogwork Assembler
