The Highland Runner

Legendary Creature — Elk Gamer6/6

When The Highland Runner enters and at the beginning of the first upkeep in a game where it's your commander, you may have each player's life total become 20. If you do, each of your commanders stop being commanders this game. Shuffle them into your library. (They no longer go to the command zone.) Ready to run (You can have two commanders if both have ready to run.)

Not legal in Commander