The goal is to make a single big attack at your opponent, though you have to wear down their defenses first, represented by a stack of cards that go into a sort of mystery zone at the beginning of the game
That makes it a perfect payoff for either Felothar the Steadfast or Betor, Ancestors Voice, the decks two potential commanders
In the same regard, I am also curious about the cards that seem fated to give players a headache because of such discouraging design
A Ritual Summon typically Tributes monsters from the hand or you control whose Level equal the Level of the monster you're attempting to Ritual Summon or more, though some cards work differently, like requiring an exact Level, sending from the Deck instead or not being allowed to use a specific Level for the Ritual Summon
Why would you want to play with a larger deck
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