SCP 1025, The Encyclopedia

Cognitohazard (When a creature enters the battlefield, roll a D6. On a 6, put a cognitohazard
counter on that creature and it gains this ability.)
When a Cognitohazard counter is put onto a creature, all creatures with a Cognitohazard
counter gets -1/-1 until end of turn.
SCP-1025 is a hardcover book, approximately 1,500
pages long. The front cover and spine feature the title
"The Encyclopedia of Common Diseases."