How about Zacama, Primal Calamity, Jin-Gitaxias, Core Augur, and Avacyn, Angel of Hope
That is because both spells add the mana at the beginning of the next main phase, not your first one
Outside of that, Lifecreed Duo is still useful, especially if you can gain a lot of life because of all the rabbits youre creating, but it really shines in the bat deck above all else
(I originally wanted to say Sephiroth as Atraxa since she's the most popular commander, but it's a reality already) The second is how they handle rarity distribution
Eaten by Piranhas Even if we disregard indestructibility, sometimes destroying someones commander with cards like Rapid Hybridization or Pongify is less desirable because it means they can put it back in the command zone and cast it again
Harnfel, Horn of Abundance is a five-mana card filtering engine