You can see the market value of any Pokemon TCG card on TCG Player by searching for the card
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Niv-Mizzet, Visionary's also a simple and elegant design that goes together with previous Niv-Mizzet cards that care about drawing cards, and as an Izzet commander it's probably one of the best commanders in Foundations
That last bit is important, as when power creep does hit, you can move your old cards on, admittedly, for less than you bought them, and spend on the new meta
If your creature can naturally come back from the graveyard a different way, like Gravecrawler, then you can flip-flop between reviving your creature the normal way and ascending them into heaven
LGS prices typically match or slightly exceed MSRP, but you avoid shipping costs and support community businesses that host tournaments and events