Prior to being fought - by the entire cast except those four - he made several "appearances" by having his personality energy through Yuya during extremely stressful or high-pressure duels - essentially giving the audience a Final Boss Preview to showcase how ruthless, violent, and controlling he is during duels
That player draws a card at the beginning of the next turn's upkeep
This lends itself well to attacking triggers, combat tricks, and multiplayer games
Those Mega Packs also have guaranteed drop rates, with one pack containing Two Prismatic Secret Rares, two Ultra Rares, a Super Rare, a Rare, and twelve Commons
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The example above, whilst official rarity is Rare Ultra, it's also a Secret Rare as it's number is 203/198