For starters, Lions Eye Diamond was officially power-level erratad, in order to restore some semblance of sanity to the format
If the second one you cast is countered, you won't win the game
Thats because some of the most powerful cards currently played in Modern can be cast for free as long as you exile a card of a specific color from your hand
Its hard for other cards to compete when it comes to flavor, since we get such an extended story as a result of this mega cycle
Akromas Will gives you a one shot version of the effect that can also be used modally as a protection spell in a pinch
And, the art doesnt match the card mechanic, which is obtusethey try to justify it in the flavor text, and I do think they justify it quite well in the flavor text, but its just very cover-of-a-1990s fantasy novel