Elesh Norn blows away the competition and I hope we see more Phyrexian cards in the future
White does have a good sweeper in Devastating Mastery
A lot of discard outlets double up as card quality or something else but you would want at least 4, likely closer to 6 in your list if you are relying on it to enable your stuff
While thats also an observation about society and social media at large, I think its super relevant to how people approach the format
Card Set(s) -EMPERORS IN THE NEW WORLD- [OP-09] CARD VIEW OP09-032 | UC | CHARACTER Donquixote Rosinante Attribute Special Block icon 3 Type ODYSSEY/Navy/Donquixote Pirates Effect [Blocker] (After your opponent declares an attack, you may rest this card to make it the new target of the attack.) [On Your Opponent's Attack] [Once Per Turn] Set this Character as active
Like a lot of the other cool, iconic legends in the set, 6 mana is a lot, but being able to flip this guy into a 9/9 that fights a creature, gives you a ton of mana, and eventually turns back into Clive rather than dying, could make it all worth it