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
Ground Seal turns off Snapcaster Mage, Deathrite Shaman, Unburial Rites, Seance, and part of Angel of Serenity
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
The real power comes in, though, when the abilities are combined with Oko's three-mana casting cost and loyalty values
Naturally, Iconic cards will be extremely rare to come by, but otherwise it may improve the odds for some collectors to get the fancier versions of cards now that Epic quality exists
It has an impact in Standard when it's been legal, and other formats play with it
