Damnit WWolfe, I was gonna do this exact post once Ikoria was fully released.
So about the keywords, I believe booster packs will (or may) have a card where you can punch out cardstock tokens of each keyword. They will most likely be bulk on online stores like TCGPlayer, so it shouldn't be too bad.
I am somewhat interested by the keyword counters, I find mutate to be interesting but too clunky for the Commander format, Companion will tread a fine line between being absolutely broken and being not worth the downside, and a return to cycling is nice.
It's likely the free spell cycle will be rdiculously expensive, which sucks, but I'm really only looking at the white one (
Flawless Maneuver) simply because it's really good protection & is another spell that can be found off of Alesha.
The Ultimatum cycle looks interesting. The Abzan one is obviously very good late game in Commander decks, as it basically says return all permanents from your graveyard to the battlefield. The sultai one looks powerful, but the 2 we've seen thus far seem well-balanced (prohibitive, expensive cost for extremely powerful effect).
Companion-wise, the two we got today don't seem as potentially breakable as
Gyruda, Doom of Depths &
Lurrus of the Dream-Den, while also not being as useless as
Umori, the Collector &
Keruga, the Macrosage.
In terms of specific cards I'm excited to slot into my Commander decks, I like:
Bastion of Remembrance: Alesha will like another
Blood Artist effect. It's hard to remove and comes down with a small body.
Wilt: Excellent replacement for
Return to Nature in Ezuri, as being able to cycle away unnecessary removal spells for more relevant cards is incredibly versatile.
General's Enforcer: Another card for Alesha. It makes her hard to block & remove, provides emergency graveyard hate, and can be
brought back by her easily.
Flawless Maneuver: I think it competes with
Boros Charm for being one of the best protection spells in white.
Fierce Guardianship: I've been looking for a replacement for
Misdirection (all the other free counters are to much $$) in Kumena, so fingers crossed it doesn't just skyrocket in price.
Species Specialist: Yet another card for Alesha. It's very versatile (can choose goblin if I have stuff like
Sling-Gang Lieutenant out), triggers even off of tokens, and comes back off of Alesha's attack trigger.
Deflecting Swat: Another powerful card that could be slotted into Alesha. I like both this and Maneuver because they can be cast off of
Sunforger or if I draw them, they are free protection spells.
I believe it was CleanBelwas who said he was a more of an og Innistrad type person.