Just look at this How does one evaluate a card like this in a draft where you can also open Sol Ring, Swords to Plowshares, Flash, Ancestral Recall, The One Ring, Ragawan, Force of Will, Lightning Bolt and all the other very, very powerful cards that are in the Vintage Cube
It's the second most valuable SIR in the set after the Pikachu, and it's earned that spot
One of the issues with lots of small tokens is that bigger decks can end up absorbing them without breaking a sweat
Now, Final Fantasy has a few things going for it that will have helped it reach this milestone
Final Fantasy I don't really see any reason why you wouldn't call Final Fantasy the #1 set of the year unless you were just being a contrarian