Agent of Fates is the heroic card closest to being viable, so if the right enabler is printed it might still have a shot
The fact that this is almost an uncommon Chatterfang, Squirrel General already makes it notable enough
While at MagicCon Vegas in late September this year, I spoke with Mike Turian, product architect for Magic (though his role while M21 was in design was principal product designer, according to his LinkedIn), and he confirmed that for M21 the design for showcase cards was intended to keep the text boxes clean and uncluttered, kind of like you would see in simple but powerful spells with only a few words on them, like Wrath of God or Counterspell
in Commander, I like Daretti, Ingenious Iconoclast and Trash for Treasure, but the skys the limit
Sythis, Harvest's Hand for a 1/2 that draws a card and gains a life whenever you cast an enchantment
Sisay, Weatherlight Captain Sisay, Weatherlight Captain is a legends-matter commander, and she is only getting stronger with the vast amount of new legendary cards printed each year
