If you cast one creature spell from your graveyard and then have a new Karador come under your control in the same turn, you may cast another creature spell from your graveyard that turn
Owner's Pokmon have not really been a part of the game since the early 2000s, and even back then many were exclusively sold in Japan
Half the time its going to be a 2/2 green Boar creature token, which is pretty insignificant in most Commander games
If you are holding Cancel when an opponent casts a spell you dont want them to have, you can respond with Cancel and counter their spell
I suppose Doctor Who introduced some timey-wimey stuff that can speed up suspend, but if this red sorcerys in your deck, odds are youre trying to do something unfair with it
While a mana curve is less important in Commander, it's still something to consider