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Forbidden Dark Contract with the Swamp King X SPELL Continuous Once per turn: You can Special Summon 1 "D/D/D" monster from your hand in Defense Position, but its effects are negated

[22] Bruno admitted to Yusei that the only reason he had a Duel with him is so that he may show him an example of Delta Accel Synchro Summon and that he had hope that Yusei could save Z-one

If your opponent Special Summons a monster(s) from the Extra Deck or you Special Summon a "Naturia" monster(s) from the Extra Deck, while this card is in your GY (except during the Damage Step): You can Special Summon this card

So, they made the choice to write it out and make the callback through the title of the cards, all of which included the word "Champion." They decided that the championing aspect was connective enough that the other ability on each card could do its own thing