Doomcaliber Knight [TU01-EN001] Ultra Rare Normal Monster Set: Sun & Moon: Celestial

Set: Sun & Moon: Celestial Storm Type: Dragon Rarity: Secret Rare Retreat cost: Colorless

Set: Sun & Moon: Team Up Type: Metal Rarity: Secret Rare Retreat cost: Colorless

You can only use this effect of "Priestess of the Ashened City" once per turn

also it can activate the 2nd effect listed above as if it were "Therion "King" Regulus"

Set: Diamond & Pearl: Black Star Promos Type: Item Rarity: Black Star Promo

Doomcaliber Knight [TU01-EN001] Ultra Rare Normal Monster Set: Sun & Moon: CelestialSet: Turbo Pack Booster One Pack Card type: Effect Monster Rarity: Ultra Rare Attack: 1900 Defense: 1800 This card cannot be Special Summoned. When an Effect Monster's effect is activated, you must Tribute this card. Negate that effect's activation and destroy the monster.