Grixis is the best color combination in that format, by far, and Green Goblin fits perfectly into an Underworld Breach strategy thanks to enabling wacky plays with Lions Eye Diamond
Use penny sleeves, top loaders, and binders to prevent whitening
Heres an example: I like cheating big creatures into play
And even when I am forced to go second, Dimensional Boundary would prove itself useful as it can render the Zodiac Beast xyz monsters useless in offense by bringing down their attack points to zero
Dragon's Maze In 2013, during our second trip to Ravnica, Dragon's Maze revisited split cards
So I really dont think that Misty is going to be played for now but this is just the type of card that is one Pokmon away from breaking the format