how rare is an ancient pokemon card Temporal Forces - Set - Roaring Moon 109/162 Pokémon TCG: 10 Best Ancient-Type

This helps shore up the fact that most madness cards just dont cut it in commander

This deck can maintain control of the field in the mid-game, using the Leader effect, you can reduce the power of characters, allowing you to KO threats and slow down the opponent's aggression until you develop your win conditions

Yes, you can't exactly say it thins the deck when it also puts cards back into the deck, but by placing them at the bottom, chances are they won't get in your way, or you could return cards such as Upstart and play it again if you draw into it anyway

It benefits from the lovely bonus of letting you ditch an unwanted card for a chance at finding something better