[quote=@Ammokkx]
Quick new Action Trap.

[b]Name:[/b] Tummy ache
[b]Trap type:[/b] Action Trap.
[b]Effect:[/b] One monster you control loses 500 ATK.

<Snipped quote by Scarifar>

I'm... not sure. Gonna need more opinions on it.
[/quote]

The non targetting thing for effects is a bit unnecessary, since it already is a free synchro play if your opponent controls a monster.