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Mathmech Diameter special summons a monster from your graveyard, making XYZ summoning incredibly easy

Spell and trap cards are generally far harder to return from the graveyard, and therefore decks that are reliant on that card type - or one powerful spell or trap in particular - may be thrown off the entire duel

Saga Skill When this card is played, look at up to 5 cards from the top of your deck, add up to 1 red Son Goku or Earthling with an energy cost of 5 or less to your hand, then shuffle your deck

They're also not worth a fortune

PSA 10 graded copies on PriceCharting reach $670+

As a note, Ezio, Blade of Vengeance can only be found in the Assassins Creed Starter Kit