Since Raul allows you to cast a milled card every turn, the card can potentially, offer four cards worth of card advantage in one rotation of the table
And they often reverse the order to really change it up into NounVerber Noun instead, like Acid-Spewer Dragon or Waveskimmer Aven or Skybinder Staff or Wayfarer's Bauble
Another huge perk these cards have over countermagic is that you can use them prior to doing your stuff giving them only one draw to find a solution but giving you the ability to spend all your mana on going off that turn
Thopter tokens, Myr tokens, Servo tokens, you name it
The stats are solid and this can improve your draws and load your graveyard early in the game
Commander decks are 100 cards including the commander, singleton except basic lands, and every card must fit your commanders color identity