These changes wont mean Bucky cant be played, but it means Bucky decks will have to be built completely differently
And theres Old StickfingersOld Stickfingers, which mills you X creature cards when you cast him
If Alisaie Leveilleur and Alphinaud Leveilleur are your commanders, your deck may contain cards with white and/or blue in their color identity, but not black, red, or green
The only sensible option was to respond to the Kavu by sacing all my lands and forcing it to shoot the only remaining legal target - itself
I believe that, past that point, it's largely a subjective opinion
Serra Ascendant turns a single mana into a massive lifelinking threat, which is why it still shows up in many of the best commander staples lists for white decks