Karmic Guide is also part of many combos, mostly involving Reveillark, Fiend Hunter, and Altar of Dementia or Goblin Bombardment
Five Best Secrets of Strixhaven in New Standard Meta Flow State If you played through the original Strixhaven era, you likely have some lingering trauma from Expressive Iteration
If you are conscious of how this card can be horrid for casual decks that arent breaking the game quite so hard, then consider Manglehorn or Dauntless Dismantler
In a vacuum, its not busted, but then neither was Skullclamp
Marcy: Since the creature doesn't get haste, I suppose the biggest use for this is to kill something that has a powerful ETB trigger or other impact
The extreme version of that deck makes use of cloning effects to get a bunch of 6/6s with a milling attack trigger