mtg phyrexia all will be one white cards Otharri, Suns' Glory [Phyrexia: Commander] creature an opponent controls Phyrexia: All Will Be One

Theres a huge amount of variation between past ultra-rare Bonus Cards like this

Stormbreath Dragon would embarrass Two-Headed Dragon even if it did rely on Hammer for haste, which it conveniently doesnt

All of this is to say I believe we need a broader lens than optimization when considering how we get our mana

Theros Beyond Death Collector Booster Box $379.99 US Shipping Only Due to export restrictions, this item may only be shipped to addresses in the United States, APO/FPO addresses, and Puerto Rico

You might have heard of the expression Brainstorm-locked it means you Brainstorm and you put back two bad cards but then you dont have a way to get rid of them, so you just have to draw bad cards in two consecutive turns and, while that can feel pretty bad, its not really a thing because other cards wouldnt deal with this problem either

Before the various Portal and Starter sets became legal, the biggest pushback against their inclusion in various formats was that two amazing cards would get added to games and warp metagames and such -the horsemanship ability, which was essentially unblockable, and Jungle Lion