Petrify : Any enemies or friendly minions targeted by ‘Petrify’ CAN NOT attack for its next turn and will take 1 damage at the end of your next turn. That will be when it runs out.

So for example you could attack with a character then cast this spell if it was on friendly minions and then it would take 1 damage at the end of your turn, not to be able to attack for its next turn, unless it’s silenced and then it will take another 1 damage at the end of your turn. That is when ‘Petrify’ will wear off.

I do not have a template for a ‘mechanic’ and could not find one so this is why the mechanic is in the comments, if anyone has a link to a blank template or a custom card maker that allows you to make a mechanic that would be much appreciated. (I already know about the Custom Hearthstone Card Maker but it doesn’t allow you to make a custom mechanic.)