You are still casting the discovered spell if you choose to, so it can be countered
This strategy if done right can totally steal their momentum and render them largely helpless
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In particular, there is no way to cast this spell to stop a creature's ability that says At the beginning of your upkeep, When this creature enters the battlefield, or similar from triggering
Likened to the long-ago-banned card Pot of Greed in Yu-Gi-Oh!, Tainted Indulgence is one of the best true draw spells printed in recent memory
Lastly, here's a look at some of the special art, shock lands, and more shown during the reveal
