Because, if youd been hoping to see pull rates as high as that set, then tragically, I have to tell you its nothing like it
Is every card in the 30th Celebration set foil
The rainbow dragon misprint i can see being worth a lot, though if you mean the normal one ya it around 30, but the misprint worth more
For each monsters flipped by this effect, gain 300 Life Points
This is one of the rare occasions in which I advocate for not the cheapest option, though I wouldn't fault you for picking up some foil UMA ones given that they have less than a 2x multiplier to their non-foil counterpart
Bladewing can bring back another Dragon creature from the graveyard straight to the battlefield, a two-for-one deal that Commander players won't usually pass up