Raging River remains as a card that stands out because there's arguably no other card in the game that immerses the terrain onto the battlefield like this one (though your mileage may very on that front)
Remember that creatures with exploit can just sacrifice themselves, which makes them sort of modal cards
Most notably, if a triggered ability asks its controller to pay a cost, you pay that cost for the copy if you wish to have it paid
If you can get any of these decks at or near MSRP, you should jump on it
My long-term expectations for these five are quite mediocre, though, and its hard to imagine these dragons being more than $15-$20 for the top two or three
This allows for a good mix of creatures and non-creature spells, ensuring you have enough threats on the board while still having room for other important cards like spells, lands, and artifacts