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Those references reflect past or house practices, not the current default

Also this is important because Mega Delphox, a GYM Promo chase in JPN for Ninja Spinner was being part of Pitch Black, instead of the set after that, it's guaranteed that Grisham is in Delta Reign , because by the process of elimination, the other promos in that Mega Delphox lineup will be blister promos for Delta Reign, meaning Grisham has nowhere to go other than the set mentioned

Elspeth, Storm Slayer (Showcase) $59.90 At the halfway mark, we have the showcase version of Elspeth, Storm Slayer

If the reasons you are wanting to play Thoughtsieze are entirely covered by another discard spell that doesn't administer pain then consider that instead

Pokemon Gyarados Rumble Promo Market Price $260.22 $150.00 Median $399.99 Prices from TCGplayer, updated 20 hours ago