It's very much a Jack-of-all-trades toolbox of different effects for various scenarios
Salamangreat Heatleo Salamangreat Heatleo is one of the 2 big boss monsters this deck relies on and boy is it a good one
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Big First Choice: The player has two major choice to take when building a deck for Mandy: first they must choose her total decksize between 30, 40 or 50 cards in total (although this step is skipped with the taboo optional rulings, as it locks Mandy to 50 cards by default), and then must choose wether having access to Rogue, Mystic or Survivor cards, with the others remaining unavailable to her for the rest of the game
Wednesday (Parallel) Attribute Slash Block Icon 2 Effect [Blocker] (After your opponent declares an attack, you may rest this card to make it the new target of the attack.) [On Your Opponent's Attack] [Once Per Turn] DON
Dethrone is usually easy to trigger, and even without it, you can use other +1/+1 counter effects to make sure your creatures keep coming back