If milling was the same, I could sit here and happily report to you that milling was indeed worth it on occasions
The symbol color won't tell you everything about power level, price, or playability, but it will give you a useful snapshot of how often that card appears and what kind of role it's likely meant to play
Its drop is not just about the switch from the Domain deck to the Aftermath Analyst decks, theres still plenty of Domain going around
If it's confined to this set, it's not worth playing
Notably, you usually cannot cast a creature card exiled with this ability on your opponent's turn unless it has flash
This is because Magic is an ever-changing game where new cards introduced into the environment make older cards more or less valuable