one piece card booster box english Game - Boxes, Booster Packs and Starter Decks 14 is themed around the Seven Warlords of the Sea One Piece Card Game OP-16:

If you have a card that turns effect damage into life gain like Intervention Pact or Samite Ministration, you can pick an absurd number like ten trillion and gain that much life

1 Elesh Norn, Mother of Machines | $30.30 Unsurprisingly, the card that was so good it was almost banned in Commander before the sets release tops this list

The clearest starting point is looking at these cards that have already been banned elsewhere

1 General Ferrous Rokiric

The gimmick of this drop was that children were given the task of drawing various creatures, and those drawings were given to proper Wizard of the Coast artists who drew the cards in the usual Magic quality