I think thats about it for Crystal Fragments, because paying 7 mana to transform it into Summon: Alexander doesnt sound like something that a deck that wants the equipment is likely to do
Dont Move is a huge tempo reset, because not only does it wipe the board of a bunch of creatures, it also makes it much harder for opponents to attack at all in the ensuing turn cycle
Whereas Sphinx Sovereign, Empyrial Archangel, and Prince of Thralls felt quite middling on the whole, you wanted to go out of your way to figure out how to get this dragon on the board
Flash makes it versatile against all sorts of stuff, including notorious card drawing permanents, planeswalkers, cascade, etc
As I was peeling off basic lands and proxies alternatively, I couldn't tell any difference in the feel of the cards
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