The single most absurd combo here would definitely be with Colossus Hammer which removes flying but gives a creature +10/+10
C-Tier: Reserved List Conspiracy Brain Fastbond ($30) Library of Alexandria ($1,300) Recurring Nightmare ($60) Rofellos, Llanowar Emissary ($42) Yawgmoths Bargain ($22) Hot take: I dont think these are so much more game-breaking that they cant be considered for unbanning, but they wont be unbanned because they are on the Reserved List and therefore Wizards cannot make any money off of the unbanning

Synergy, Griefing, Staples, Building a Doran Deck ) Commander Starter Kits 1 (kick start your allied two-color decks for $25) Commander Starter Kits 2 (kick start your enemy two-color decks for $25) Commander Starter Kits 3 (kick start your shard three-color decks for $25) Commander write-ups Ive done (and links to decklists) : Zurgo Bellstriker (Bellstriking Like a Boss) Dragonlord Ojutai (Troll Shroud) Karrthus, Tyrant of Jund (Dragons, Megamorphs, and Dragons) Dromoka, the Eternal (One Flying Bolster Basket) Shu Yun, the Silent Tempest (Tempests and Teapots) Tasigur, the Golden Fang (Hatching Evil Sultai Plots) Scion of the Ur-Dragon (Dragon Triggers for Everyone) Nahiri, The Lithomancer (Lithomancing for Fun and Profit) Titania, Protector of Argoth (Titanias Land and Elemental Exchange) Reaper King (All About VILLAINOUS WEALTH) Feldon of the Third Path (She Will Come Back to Me) Sidisi, Brood Tyrant (Calling Up Ghouls with Sidisi) Zurgo Helmsmasher (Two Times the Smashing) Anafenza, the Foremost (Anafenza and Your Restless Dead) Narset, Enlightened Master (The New Voltron Overlord) Surrak Dragonclaw (The Art of Punching Bears) Avacyn, Guardian Angel

One copy of every version (foil and non-foil) of every card printed in 2020