While the breadth of Modern discard makes this less of a problem, there are still matchups where Thoughtseize isn't very good, such as against decks like Dredge that want cards in their graveyard or against Burn, where the damage you take is relevant
And there are lots of other great builds too, decks like Ethan's Typhlosion, Joltik, and Charizard ex that are sitting just below the cream of the crop
While many competitive cards lose value once they rotate out of the Standard format, Gengars status as a fan-favorite has kept its market price climbing, currently sitting around $160
The general read in the community is that this is a character pull first and a playable Supporter second
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The top 10 cards that make Magic a better game: 10