Lightning Dragon [Urza's Saga Promos] 21a Useful rules references cover the

Useful rules references cover the screen’s interior

I see … decay in all flesh

Set: EX: Power Keepers Type: Psychic Rarity: Ultra Rare Retreat cost: Colorless

you will take whatever they use to hold it in and build a castle out of it

and the old religion

Lightning Dragon [Urza's Saga Promos] 21a Useful rules references cover theSet: Urza's Saga Promos Type: Creature Dragon Rarity: Rare Cost: {2}{R}{R} Flying Echo {2}{R}{R} (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.) {R}: Lightning Dragon gets +1 +0 until end of turn.