Teysa Karlov or Extus, Oriq Overlord immediately pop into my brain
Honorable Mentions GO TO JAIL GO TO JAIL sees some play in casual formats and Pauper/Peasant Cubes as an interesting Journey to Nowhere variant for only 1 mana
Interestingly, the card can only be played when it is the final card in the player's hand, but then allows someone to search their deck and pull out two cards to put in their hand, which could be a crucial play at the end of a game
Effects such as these arent always popular in Commander, but Herald of Eternal Dawn coming with flash does make this a lot more interesting, as you can cast this at instant speed in response to an opponents Thassas Oracle win the game trigger, for example
Although the Butterfree is most common with this error, in rare cases other 1st edition Jungle commons have been found with the same defect
Magical Charm, Sylveon exs first attack, deals 160 damage while reducing the next incoming attack by 100 damage, which is a nice cushion for keeping Sylveon ex safe