I encountered the same situation except I was on the other side. I could tap the creatures of my opponent (and only their creatures, I did not have the option to tap my own creatures) and I could even tap his permanents that had Ward without paying the cost.
I encountered the same situation except I was on the other side. I could tap the creatures of my opponent (and only their creatures, I did not have the option to tap my own creatures) and I could even tap his permanents that had Ward without paying the cost.