UW Control Control decks are generally good matchups for Mono-White even though were not particularly teched out for them, because theyre so clunky and we have Thalia, Archon, and Spellbinder to tax them
It has a ton of useful text, lets you ramp, and can even work as a decent Sultai commander
Of course, we all know it was really the library manipulation that made this deck so good, not the least of which was the Intuition / Accumulated Knowledge engine
As if discard and sacrifice effects werent hated enough, you also get to steal the permanents that your opponents discard and sacrifice
Nihilego has a weak attack that inflicts Poison on the opponents active Pokmon, but its real strength is its ability, aptly named More Poison
For Investors : Obsidian Flames (risky but high upside) or Paldea Evolved (safer, balanced value)