Altar of Dementia is a free sac outlet that can mill players out with the right combination of recursive creatures, though its also great at fueling your own graveyard, too
Some day well have a more definitive answer here (or if I had a month to go set by set and calculate with the unique number of foils and that particular set of languages), but until then, I think we should estimate higher
The Reserved List solved an existential crisis back in 1996, but because it promised that the cards on the list would " never " be reprinted (and because Wizards has mostly kept this promise for 25 years), it has ended up causing problems in the decades since as we are stuck with a supply of Gaea's Cradles, Underground Seas, and Lion's Eye Diamonds befitting a game with hundreds of thousands of players for a game that now has 20 million
All of these are pretty "meh:" Chain Reaction and Starstorm work but aren't exciting, and Collision of Realms doesn't have any special synergies so why is it even here
The signature tribe for Green, Elves, also have a lot of cards in Black, and several in White