Opening of the Spirit Gates

When this card is activated: Add 1 "Uria, Lord of Searing Flames", "Hamon, Lord of Striking Thunder", or "Raviel, Lord of Phantasms", OR 1 monster that mentions any of those cards, from your Deck to your hand. Once per turn: You can discard 1 card; Special Summon 1 Fiend monster with 0 ATK/DEF from your GY. Once per turn, if you control a Level 10 monster: You can add 1 Continuous Spell from your GY to your hand. You can only activate 1 "Opening of the Spirit Gates" per turn.