Looking at the current metagame, it seems that Modern is moving away from broadly useful cards, and leaning into sideboard haymakers
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8 Falkenrath Aristocrat An extremely lethal creature, Falkenrath Aristocrat is a difficult creature to deal with
It is, however, quite pretty. Saprazzan vizier Illustrated by Gao Yan Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp
However, you can consider playing fewer than four copies of a card if: It gets worse in multiples (such as legendary creatures) It's only useful against certain matchups It's a win condition, and your control deck will have time to dig through the deck and find it You're stuck choosing between two cards which have equally strong, similar, but slightly different effects (you could play two of each) It's a slightly worse version of a card you have four copies of already, and you're including it because you want even more of that effect
This could lead to some sort of combo deck with Paradoxical Outcome where you are able to cast a lot of cheap artifacts and draw tons of cards thanks to Jhoira, Weatherlight Captain