List of cards that were good, but GENERALLY aren't anymore because games are quicker or there are simply better cards. From Episode #355 of The Command Zone podcast (October 2020) – https://youtu.be/0Z9qaRJFuVA

Explanations/transcript below.

Ramp – 3cmc or more mana rocks are too high cost, and mostly 4cmc ramp spells are too high cost

Card draw – too high cost / too situational

Removal – too high cost / too slow (needs to be instant and 3cmc or less, ideally 2cmc)

Board wipes – too high cost / easy to play around

Tapped lands – too slow, can have a few but not many (cbs listing them properly –guild gates, tris, refuges, hideaways)

Utility lands – too high cost / risky

Game finishers – too high cost / too slow / easy to play around

Too slow – ... too slow

Outclassed – there are better versions