Outside of cEDH, I think Hexing Squelcher has serious eternal format potential as well
(Treat them and anything attached to them as though they don't exist until their controller's next turn.) Creature - Knight Spirit Color tag templates(None) Keeper of the Accord At the beginning of each opponent's end step, if that player controls more creatures than you, create a 1/1 white Soldier creature token
This card is extremely flexible, but in powerful formats like Vintage, simply searching for Ancestral Recall or Black Lotus is a great way to pull ahead
Thankfully, that power translates very well into Magic: The Gathering, unlike The Ring of Lucii
Instead, sideboard with the opponent's plan in mind
And now that set is still getting squeezed