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

This gets around almost every form of protection, allowing for Alpha to clear out the opponent's problem Monsters easily

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

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

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