Tasha mills usually 20ish cards, and it is easily the best mill spell in the deck
It is still usually worth playing in these decks if you have some triggers for it and red mana
Convert to Slime gives you a three for one, and if you have Delirium, you get a fonky chonky Ooze for your troubles, making it a four for one, for five mana
When anything could happen, how could an opponent prepare for it

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And so, until both our environment and our own hangups around socializing ease up a bit, this series continues to exist in a bit of a holding pattern