Hi. This card effect is
If this card is sent to the Graveyard: You can banish 1 Level 7 or higher LIGHT or DARK Dragon-Type monster in your Deck. Then, if this card in the Graveyard is banished: You can add the monster banished by this effect to your hand.
What if, it is sent to the graveyard twice then banished?
For example, it is first milled to the grave by ryko. Effect activates, i banish red eyes darkness metal dragon from deck. Then, i call of the haunted it, use it for some synchro summon. Its effect activate again, i banish a blue eyes white dragon from deck. Then i summon chaos soldier by removing eclipse wyvern and another monster from play from the grave. So, eclipse wyvern effect activates, which card do i add to the hand? Or do i add both redmd and bewd?