You can Special Summon this card (from your hand) by sending 1 Xyz Monster from your Extra Deck to the GY. If Summoned this way, you cannot Special Summon from the Extra Deck for the rest of this turn, except Rank 4 Xyz Monsters. You can only Special Summon "Ext Ryzeal" once per turn this way. If this card is Normal or Special Summoned and you control no other face-up monsters, except Level/Rank 4 monsters: You can add 1 FIRE Thunder monster from your Deck to your hand. You can only use this effect of "Ext Ryzeal" once per turn.