nope you cannot prevent toon kingdom, when toon monster get destroyed and when toon kingdom prompt whether you want to remove card from top of your deck, it does not start a link chain
I am almost sure that it work against toon kingdom, since it says "Spell/Trap Cards, and their effects". Since it stops their effects, toon kingdom can not be used. Magic jammer only prevents spell cards to be activeted
Anoymous
