while reading the card it says destroy 1 monster with the highest attack, does this mean if my monsyter has the highest attack does that mean does that mean my monster gets destroyed? how does it work?

Easy to figure out just by reading the card...yes...it can destroy your own monster if you have the highest ATK monster in Attack Position on the field..


Just compare it to Smashing Ground and Fissure...


Hammer Shot
Normal Magic
Destroy 1 face-up Attack Position monster with the highest ATK on the field.

Smashing Ground
Normal Magic
Destroy 1 monster with the highest DEF on your opponent's side of the field.

Fissure
Normal Magic
Destroy 1 face-up monster with the lowest ATK on your opponent's side of the field. (If it's a tie, you get to choose.)

yes hammer shot targets both fields....there for if you have mobius and your opponent has don...

cyber is destroyed...that is why people run smashing ground instead.

Ehh...i think you mean Mobius is destroyed....Cyber Jar isn't even in the example