It's notorious for a few reasons, and unsurprisingly, it's the usual story of scalpers ruining it for Pokmon trainers and collectors, causing chaos to the point that the museum stopped giving out the card
This can be before blockers are declared, after blockers are declared but before combat damage is dealt, during combat after combat damage is dealt, during the postcombat main phase, during the end step, or, in some unusual cases, during the cleanup step
The plot is very simple and straight-forward, allowing you to focus more on the gameplay itself
When it arrives, it will Price of Progress each player damage, which was often a kill for many way back when it was printed, given how much Commander folks love their nonbasics
How long this Enchantment sticks around will depend on the playgroup, but paying one life for a Treasure is a pretty good rate, especially if it can get you (and your opponents) two plus turns ahead
Cyclonic Rift IS on the list