In Pioneer, its invaluable to allow WU decks to win the game without creatures so they can companion Kaheera, the Orphanguard
Cards that exile your graveyard once, like Relic of Progenitus or Tormod's Crypt, can be problematic
The dont overthink it template plans If you want a simple default that still looks great: Plan A: The clean deck plan Modern for 90% of the deck Full Art for lands Showcase for commander + 5 favorite cards It looks cohesive, reads easily, and still has personality
In Collector Boosters, there is a dedicated slot to getting a non-foil card: either a rare Saga from the Kaldheim main set, one of five thematic Kaldheim rares that aren't found in Draft Boosters, or one of the Kaldheim Commander Deck rares or mythic rares
Graveyards are in constant need of pruning in EDH, and having a reason to play a GY removal card as good as you get the best card out of the total opposing yards is reason enough
For instance, if you have regular Pikachu but not Pikachu Ex, that will still count for your progress towards getting Mew