Atlantean Dragoons [SDRE-EN002] Super Rare Cyberse You can oly use this

You can oly use this effect of "Litmus Doom Ritual" once per turn

except for LIGHT monsters

Set: Shonen Jump Magazine Promos Card type: Effect Monster Rarity: Ultra Rare Attack: 2200 Defense: 1800 Once per turn

then you can Special Summon 1 "Blue-Eyes White Dragon" from your hand

Atlantean Dragoons [SDRE-EN002] Super Rare Cyberse You can oly use thisSet: Structure Deck: Realm of the Sea Emperor Card type: Effect Monster Rarity: Super Rare Attack: 1800 Defense: 0 All Level 3 or lower Sea Serpent Type monsters you control can attack your opponent directly. When this card is sent to the Graveyard to activate a WATER monster's effect: Add 1 Sea Serpent Type monster from your Deck to your hand, except "Atlantean Dragoons".