Incorrect rules interactions
The card Graveyard Shift says as follows:
"This spell has flash as long as there are five or more mana values among cards in your graveyard.
Return target creature card from your graveyard to the battlefield."
But when you played it looks more like it has "is equal to the number of card types among cards in your graveyard" instead.
if you try to flash it beacuse YOU HAVE IN THE GRAVEYARD a Titan of Industry, a Dusk Mangler and Thrill of posibility or a Cathartic Pyre. it would not allow it to cast it because you will only have just two types of cards BUT the MANA VALUE of the total of the cardS in the graveyard is 16!.
AND Tainted Indulgence HAS THE SAME ISSUE! Would be nice if this two interaction were fixed or if the are lazy enough just change the text.
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Muggle_of_the_Coast#19144 commented
"Five or more mana values" doesn't mean that the total of the mana values in your card is at least 5. It means you have at least 5 different mana values represented among the cards in your graveyard.
For the example you gave, your graveyard consisted of
* Titan of Industry (Mana Value 7)
* Dusk Mangler (Mana Value 7)
* Thrill of Possibility (Mana Value 2)You currently have two mana values in your yard: Specifically, you have Mana Values 2, and 7. That means you can't cast it with flash.