I think the one thing I would've liked to see more of in the list are summon cards: if you look at our commander options, Tidus, Yuna's Guardian and Yuna, Grand Summoner, both clearly work exceptionally well with the new summon creatures like Summon: Valefor as Tidus can remove lore counters to keep them around longer and Yuna can pump up creatures when the summons die, and that's a unique new game design space that would differentiate the deck from more generic +1/+1 Counter lists out there
Krenko is a four mana 3/3 thats rubbish on his own, but can tap to make X 1/1 Goblin tokens where X is the number of Goblins you control
I'm quite certain I don't even do black justice here, but I'll refrain from bloating this response further
Three Steps Ahead One of the best Cancel variants, Three Steps Ahead provides an instant-speed Clone that sometimes hits a spell and filters your hand, giving it graveyard synergies on top of the token stuff
Set Booster Rarity Breakdown: "THE LIST" CARDS FROM MAGIC 'S HISTORY
It has an impact in Standard when it's been legal, and other formats play with it
