It stops your opponent from playing spells with even CMCs, and if they control any creatures with even CMCs, then they can't block (and your opponent wouldn't be able to play any more of them anyway)
The Tempest copies havent been drastically affected by the mass C14 reprint, so even if you have the old school version you didnt lose that much value (due to the new art and card look compared to the old version)
And if you want to get some digital cards - they won't appreciate in value - but you can pick up some freebies anyway with all these MTG Arena codes and our guide to the MTG LOTR release date.
I remember seeing a card signed by John Finkel for sale on ABUGames website at one point as well
What I find most engaging to new players is the potential to cast the powerful spells they see depicted or summon the fantastical beasts that they couldnt otherwise imagine
This makes it a more aesthetically interesting card to me, and it's also the rarer of the two given how hard it is to track down English copies of Portal Three Kingdoms cards