You cannot Xyz Summon monsters with the same name as a card you control. You can target 2 "Ryzeal" cards in your GY, except "Ryzeal Cross"; place them on the bottom of the Deck in any order, then draw 1 card. You can only use this effect of "Ryzeal Cross" once per turn. Once per turn, when a monster effect activated by your opponent resolves, you can detach 1 material from a "Ryzeal" Xyz Monster you control, and if you do, negate that effect.