Levia-Dragon - Daedalus

Edison Card Text
Send "Umi" on your side of the field to the Graveyard to destroy all cards on the field except this card.
Invasion of Chaos • 2007-06-25
No targeting
No Damage Step effect
Banlist • Unlimited
Interactions
Why does Judgment Dragon still wipe the field if Book of Moon is chained to its effect?!
Judgment Dragon activates its effect and Book of Moon is chained.
Because Judgment Dragon's effect destroys "all other cards" based on the field state at activation; flipping it face-down does not change which cards are "other."
Does Levia-Dragon - Daedalus have priority to use its effect after being Summoned?!
Levia-Dragon - Daedalus is Summoned in an open game state.
Yes. It is an ignition effect, so the turn player has priority to activate it first.
Rulings
edisonformat.net
●You can send A Legendary Ocean to the GY to activate Levia-Dragon Daedalus' effect, but you can't send Maiden of the Aqua.
●You can't send a face-down Umi or A Legendary Ocean to activate Levia-Dragon Daedalus' effect.
●If you activate Levia-Dragon Daedalus' effect and your opponent chains Ring of Destruction to destroy Levia-Dragon Daedalus, Levia-Dragon Daedalus' effect still resolves even though it has been destroyed.
●If an effect is chained to “Levia-Dragon Daedalus'” effect to flip “Levia-Dragon Daedalus face-down, it is still not destroyed by its effect.
edisonformat.com
You can send "A Legendary Ocean" to the Graveyard to activate "Levia-Dragon Daedalus"' effect, but you can't send "Maiden of the Aqua".
You can't send a face-down "Umi" or "A Legendary Ocean" to activate "Levia-Dragon Daedalus"' effect.
If you activate "Levia-Dragon Daedalus"' effect and your opponent chains "Ring of Destruction" to destroy "Levia-Dragon Daedalus", "Levia-Dragon Daedalus"' effect still resolves even though it has been destroyed.
If an effect is chained to “Levia-Dragon Daedalus'” effect to flip “Levia-Dragon Daedalus" face-down, it is still not destroyed by its effect.