Look at the bottom left or right corner of the card for 2 numbers separated by a backslash
Though I have provided many warnings, if you keep those in mind, there are three primary instances where milling can be correct to pursue
Three Tree City Three Tree City is typal Nykthos, Shrine to Nyx, and everybody loves more mana
A Reserved List Repeal Probably Wouldnt Make Legacy Cheap Enough To Cause a Significant Increase in the Player Base The most played deck in Legacy right now, Grixis Delver, requires no Reserved List cards outside of six dual lands
It can't be countered or stopped by cards like Phyrexian Revoker
In Midnight Hunt, Zombies are the most powerful tribe and Hobbling Zombies shores up its minor weakness against aggressive decks like BR, RG, and RW while enabling exactly what the tribe wants to do