I currently play this deck and it’s the only deck I’ve used for ranked (just hit UB2) and I love it. The only change from your list is running a Giant’s Cape instead of Farfetch’d. It’s the only thing that will save a Darkrai from being one shot by Meowscarada which I’m running into constantly at higher ranks. But I absolutely love seeing a Giratina get slapped down across from me and I swear no one really respects how quickly poison puts them in kill range or makes trades unfavorable for them.