Dark End Dragon [RYMP-EN066] Super Rare Shadows in Valhalla when an opponent's DARK monster

when an opponent's DARK monster activates its effect: You can detach 1 Xyz Material from this card

If this card is in your GY: You can target 1 of your banished "Aleister the Invoker"

you can take control of that monster until the End Phase

• During either player's Battle Phase

Dark End Dragon [RYMP-EN066] Super Rare Shadows in Valhalla when an opponent's DARK monsterSet: Ra Yellow Mega Pack Card type: Synchro Effect Monster Rarity: Super Rare Attack: 2600 Defense: 2100 1 Tuner + 1 or more non Tuner DARK monsters Once per turn: You can target 1 monster your opponent controls; this card loses 500 ATK and DEF, and you send that target to the Graveyard.