Trying to find new examples of Magic cards that are theoretically strong, but in practice are widely cut from decks because they create logistical problems. The classic one to cite would be Cathar's Crusade. Simultaneously the best and worst card for tokens decks ever printed.

The more I think about how my deckbuilding skills have evolved while playing #EDH, the more I realize that sometimes a deck just has to be re-built from scratch if it's not hitting the vibe that you want. No amount of swapping out individual cards will fix a foundation that isn't cohesive.