Legendary Duelists: Immortal Destiny bridges the gap between the two strategies, making it easier than ever to Synchro Summon the Sun and Moon Dragons, find Wiraqocha Rasca, and win with it in one clean strike

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They'll be included for the sake of completion, but I wouldn't take them as any sort of precedent
Both types of cards target your own creatures to give them some kind of boost, usually ones that make them better for combat, which also lets you trigger their valiant abilities
your opponent cannot activate any card effects in their GY this turn
Saying this fills your quota of one-mana cards isn't true at all