yugioh light and darkness dragon deck *** *** QUARTER CENTURY SECRET RARE MP24-EN024 YUGIOH! Deck Horus Light and Darkness

Forcing each player to shuffle their entire discard piles back into their decks, Lysandre's Trump Card effectively eliminated the possibility that a player would run out of cards, which would otherwise mean victory for their opponent

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It has some decent tricks to it like: Gravekeeper's Servant and Dimensional Fissure, Unhappy Girl and Spirit Barrier, two or more Magician's Valkeria to guard all mages from attack

As for answering your original question, @fourthstartcg did a good job breaking it down

III Triple When you next cast an instant or sorcery spell this turn, copy it twice