Here are some things to look for when examining the quality of the card's printing and materials: Card stock
Its power, toughness, and the number of folds it has (zero) remains the same
This ones great because it lets you see the most cards without secondary assistance from something like a shuffle effect
You'll see this on a large scale, like the Wicked Slumber seizing the population, or with something as simple as some fae trickery
Delirium was also a core mechanic of the next set in this block, Eldritch Moon , which featured Emrakul's emergence into the plane and subsequent warping of the plane into a Lovecraftian horror: Since its original printing, Delirium has shown up as a mechanic in only a few other Magic sets, Modern Horizons 2 and 3 , and Duskmourn: House of Horror
There are no graveyard synergies and a lot of redundancy rather than specialization