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And then, during your upkeep, you can place a counter of the judgment variety on it

Specifically, the undying ability triggers when the undying creature goes to the graveyard

Its effect of slipping into your opponents deck is also perfectly fitting for the theme

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However, unlike spell cards, which are most often activated on a player's turn, trap cards have to be set in the Spell/Trap Zone and then activated on a later turn, typically your opponents turn