is this a good trade?

Depends. Which rare cards come with it? Generally it's a good idea, but if all you get is commons, it may not be worth it. Also, if you are a player, and not a collector, it may be a good idea to check if those cards are in the modified format.
 
I assume this sale cards from all sets?
If so, and none of them you need... Then I would not do it...
 
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