Sometimes, a subject's popularity is more important for a card's value than anything else
*** Were one week away from the release of Midnight Hunt on MTG Arena, and its already looking to be a very exciting Standard
Here, the 'cleanest' line of argument for plague themed cards being banned is: "MtG has plague themed cards, there is a current pandemic whihc is bigger than any other recent pandemic, I know somebody who died becuase of the pandemic, I'm angry at any reminder about the pandemic, ergo, I am angry at WotC for having cards which remind me of this." This is very clearly a stretch, as the same argument could be that the game in general depicts death and somebody might be upset about the death of a loved one (from a COVID unrelated issue)
If you havent tried it out in casual decks, its well worth a shot
While not the most potent hate card, Mare does substantially disrupt the opponent and/or protect against Burn's gameplan, depending on how you evaluate lifegain