Tengu format ruling
Nega-Ton Corepanel
Card effect (current official text)Activate only if you control a face-up "Koa'ki Meiru" monster and have "Iron Core of Koa'ki Meiru" in your Graveyard. Negate the activation of an Effect Monster's effect, and destroy it.
Rulings
- If you don’t control a face-up "Koa’ki Meiru" monster or don’t have "Iron Core of Koa’ki Meiru" in your GY when this card resolves, its effect is still applied.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Tengu forum — sourced change requests get reviewed.