MonZap presents TCGPlayer and Cardmarket reference prices where available
Nonlegendary I expect the nonlegendary spells to be quite a bit less spicy on average than the legendary ones, so Dawn of a New Age fits into expected spaceand is still quite good
2 PSA 10s exist and 9 PSA exist The only card that was sold in recent years wasnt in good enough condition to receive a grade (mostly because of fading), but it still went for a whopping PSA AUTHENTIC $50,300 [Source] Imagine what a PSA 9 or 10 would sell for
The big difference here is you dont control any permanents to produce mana or sacrifice at the start of a game, whereas the rules let you start with a full grip of seven cards ready to be spent immediately plus another free one each turn
Tinker was one of the many reasons that the Urza block became so powerful and is banned or restricted in every format
All in all, Doubling Season is a stellar reprint, no matter which way you look at it