While not for every deck, these cards definitely dont see quite as much play as they really should, and should be considered for any deck containing several cards that benefit from interacting with your graveyard
This mechanic has been used sparingly in various Commander precons, and appears on the following cards: Crdan the Shipwright Elrond of the White Council Mob Verdict Trap the Trespassers Truth or Consequences The Council Will Decide Your Fate The Valeyard | Illustration by Tyukina Tatiana Well, we made it to the end
There are so many episodes of Doctor Who and only so many cards to make, that planechase gave us a few extra places
Massacre Girl, Known Killer granting Wither to all your creatures gets around usually-reliable protection like Indestructible, with -1/-1 counters dragging your opponents forces down into oblivion
The clear answer was Investigate a keyword that creates Clue tokens whenever your characters "look into" something strange