Whether used to copy Moxen, Black Lotus, or other broken artifacts, Copy Artifact has always been a sleeper powerhouse, restricted in Vintage format due to its sheer efficiency
Black Lotus is the poster-card for how expensive MTG can be, and thats unlikely to ever change
Because damage remains marked on a creature until the damage is removed as the turn ends, nonlethal damage dealt to a creature may become lethal if Eye of Nidhogg becomes attached to it or unattached from it during that turn
Since there are multiple formats where practically every card from across Magics expansive thirty-year history is playable, all the cards must remain the same size to ensure players wont be able to tell different cards apart in their deck
If a card had a low of $2, a mid of $5, and a high of $7 in Scrye, you were less likely to trust that $5 number because you knew that it varied pretty widely