Double deck, double the decisions
Every rank appears twice in Variegated Demon. This creates opportunities (if one copy is buried you still have another) but also risks (duplicates can clog the same tableau column or waste pile). Actively track both copies of key rank-suit combinations when planning foundation builds.
Common mistake
Players instinctively try to sort the tableau as neatly as possible with 5 columns available. But 104 cards means more cards in the stock and more redeals matter. Spending redeals on cosmetic tableau rearrangement instead of foundation progress is the most common way to run out of moves.