In the case of Avatar, the 15 most expensive cards would cost an eye-watering $4,230 to purchase, and that's just one copy each and without considering the most expensive card of the bunch, which goes for a staggering $5,300 on its own
Certainly Magic has created a number of horror-infused planes, like Innistrad, New Phyrexia, and Duskmourn, but letting fantasy artists loose with the card designs and color identity in black has generated quite a body of really messed up stuff
Long River's Pull
Which sides of Alrund, God of the Cosmos/Hakka, Whispering Raven can I cast
While each damage tick is not a lot, the consistent ping of damage can be incredibly frustrating