Speaking of U/R, Fevered Visions is another card spoiled late in the season that some people missed
Therefore you're typically going to play Tablet of Discovery on turn four, and this is important, before you've played your Land for the turn
If something is also wildly powerful in the 99, or simply unfun all around, we're fine leaving it on the list, but power alone isn't a reason to list it as a Game Changer
Is it an absolutely awful card
Urza, Lord High Artificer Expropriate Cyclonic Rift Opposition Agent Tergrid, God of Fright // Tergrid's Lantern Cyclonic Rift is a flexible bounce spell that turns into a one-sided sweeper
Just make sure the listing says sealed if you want an unopened product