Edison format ruling
Adhesion Trap Hole

Card effect (current official text)When your opponent Summons a monster(s): Halve that monster(s)'s original ATK.
Rulings
Activate only when your opponent Summons a monster(s). While that monster(s) is face-up on the field, its original ATK is halved.
- Adhesion Trap Hole works against a monster or monsters, so Adhesion Trap Hole does NOT target.
- When Cyber Jar is activated, you may use Adhesion Trap Hole against all monsters your opponent Special Summons in face-up Attack Position, but Adhesion Trap Hole has no effect on any monsters your opponent Special Summons face-down.
- Adhesion Trap Hole cannot affect monsters Special Summoned face-down with The Shallow Grave, Morphing Jar #2, etc.
- If a monster affected by Adhesion Trap Hole is flipped face-down (with Book of Moon, etc.), Adhesion Trap Hole's effect disappears and the monster's ATK is back to normal.
- Adhesion Trap Hole halves the original ATK, so if you activate another effect that alters ATK, halve the original ATK first and then resolve the other ATK-modifying effect.
- If a monster affected by Adhesion Trap Hole is then equipped with Megamorph, only Megamorph's effect applies.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Edison forum — sourced change requests get reviewed.