Depending on the type, each set will normally have its own theme, either based around a particular fictional setting in the lore, or perhaps tailored to one particular mode of play, like the Commander or Modern formats
There are a bunch of ramp and card draw creatures, too
At the same time, the most played deck in the format was Mono-Red Aggro, which was extremely cost effective
Inscription also feels like the card that pushes Tainted Adversary into the realm of being good, or maybe they just needed to work together
The first is to actually check your collection in-game
This is because you are more likely to see a specific common in any given card pool than a specific rare