Mermaid Archer

Edison Card Text
① Once per turn: You can target 1 face-up Level 3 or lower monster you control; equip that target to this card (Max.1).
② Gains 800 ATK while equipped by this effect.
③ If this card would be destroyed, you can destroy the monster equipped to it with this effect, instead.
Targets
Note: the first effect
No Damage Step effect
Banlist • Unlimited
Interactions
If Plaguespreader Zombie revived by its own effect becomes an Equip Card (e.g., to Mermaid Archer), is it still banished when it leaves the field?!
Plaguespreader is Special Summoned by its own effect, then equipped to another monster and later leaves the field by various means.
The discussion is inconclusive. Some rulings analogies (e.g., Dark Magician of Chaos equipped to Relinquished) suggest the lingering banish condition should still apply while it remains face-up on the field, even as an Equip Card. However, tests in older video games reported Plaguespreader going to the Graveyard instead of being banished. For Edison, this remains disputed and should be verified with primary sources.
If Plaguespreader Zombie revived by its own effect becomes an Equip Card, is it still banished when it leaves the field?!
Plaguespreader is Special Summoned by its own effect, then equipped to Mermaid Archer and later leaves the field.
The discussion is disputed. Some analogies (e.g., DMOC equipped to Relinquished) suggest the banish condition persists while it remains face-up, but video-game testing reported it going to the GY. For Edison, this was left unresolved pending primary sources.
Rulings
edisonformat.net
● If both this card and its equipped monster would be destroyed at the same time, you can't use the ③ effect to prevent its destruction.
edisonformat.com
“Mermaid Archer’s” effect to equip itself targets the Level 3 or lower monster you control.
If “Imperial Order” or “Spell Canceller” are active, “Mermaid Archer” still gains the 800 ATK from a monster equipped to it.
If “Mermaid Archer” and the monster equipped to it would be destroyed at the same time (by “Judgment Dragon,” for example), you cannot destroy the equipped monster to save “Mermaid Archer.”
Only monsters equipped to “Mermaid Archer” by “Mermaid Archer’s” own effect can be destroyed instead of “Mermaid Archer.”
If “Mermaid Archer” is equipped with a monster by its own effect, and also equipped with “Metallizing Parasite – Lunatite” at the same time, and it would be destroyed, “Metallizing Parasite – Lunatite” automatically destroys itself with its effect, so you cannot choose to destroy the other monster equipped to “Mermaid Archer.”