Your vehicles are rarely creatures on your opponents turns (Armed and Armored aside), so it doesnt usually matter whether theyre tapped
With that, the XYZ monsters tend to follow the trends of the monsters being used for them: Zombies have the powerful game advantage making effect, the Fiends have battle phase tricks and lastly the Spellcasters all flip things face-down
There we have it, some of the most expensive Pokemon cards of all time
Unlike most of these commanders, Rocco's also on the lookout for opponents who are doing this
I'm not entirely sure though if that does anything specifically off the top of my head that makes this broken, but it certainly seems like there's value to be found in this card
Lets start with Timothar, Baron of Bats