Cards in the graveyard cannot be a target for spells and abilities Is not working
Dennick the Pious Apprentice by the name of its ability should stop “Behold the Multiverse” and similar which has an effect of milling cards then summoning on the controllers side of the field. The milling should play out but the fact that its still able to target and summon cards is a bug. This bug plays out for other cards that target the graveyard so I believe its a dennick scripting issue not the other card, this is just my first time recording it
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[Deleted User] commented
Cards like Breach the Multiverse and Takenuma, Abandoned Mire DO NOT TARGET the cards they return. They couldn't function as intended if they did. Because targets have to be chosen when a spell/ability is put on the stack. But those cards are meant to be able to return cards that are put into the graveyard during resolution. So it is during resolution, that the cards to return are simply chosen and then returned.
Remember, that only spells and abilities that use the word "target" target the thing they are going to affect. Objects and players can be affected without being targeted.