Welcome to the wonderful world of RPGs
We're also seeing significant drops across most modern Pokmon TCG card values, which means it's a great time to snag single cards before they go back up in value over time
Though I have provided many warnings, if you keep those in mind, there are three primary instances where milling can be correct to pursue
An Aura put onto the battlefield this way doesn't target anything (so it could be attached to an opponent's permanent with hexproof, for example), but the Aura's enchant ability restricts what it can be attached to
It also still counts as an enchantment, letting you get all the benefits of both
However if you plan on building first edition sets from the early days of Pokemon, the list below should help you