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In short, the best clue is not empty equals late. The better clue is high-demand items are gone and the product mix no longer makes sense. That is when a refill becomes more likely

So, why specifically black

There are also Reverse Duels where you play as the antagonist, local and online multiplayer, and Sealed and Draft Battle Modes for that tournament-like feel

Vayne's Treachery also shines here

Ting-Lu ex is a questionable card with its only positive being its ability, which can turn off any Pokemon's ability (besides exs) if they have damage counters on them as long as it is in the Active Spot

Confiscation A lot of the most powerful generic cards in Yu-Gi-Oh history are spells