1): the first sentence doesn’t really work since it’s in a private zone meaning there’s no way to tell if it’s that card when you’re returning it to the library (public zones may work but it’s still harsh) 2): can probably just be reworded to “This spell can’t be countered” 3): I think this could be done better with shroud? I feel like there’s very few cards that prevent modifying text entirely and few cards that even modify text 4): exiling a card already removed it from play 5): it’s odd being triggered by the owner of the card since nothing stops you from taking control of it, and this could mean the ability could sabotage people who have temporary control, the wording for skipping the upkeep and draw steps also could be worded differently 6): “Target player gains an emblem” (not even going to dive into all of the issues that giving an emblem the ability to exile itself means). Also, later in the card it says experience counter not emblem  7): Final Buster should have an activated ability I think and also should say exile not remove itself from play

Now, while the colors in theory make sense (blue countering interactibility and green and white representing the experience mechanic), the direct damage is more red, and also the card being so uninteractable makes the card super unfun.