When paired with any 1-mana accelerant, say, Llanowar Elves, it becomes a massive threat that must be answered
Probably works best in Group Pain decks like Mogis, God of Slaughter and Rakdos, Lord of Riots, though those decks have access to Black so you already have great card draw
The discussion may have veered off-topic briefly, but it's interesting to consider the potential shifts in color pairings and the impact of colorless-themed sets on deck construction
Theres a tough balancing act in finding the right number of black cards to make sure you can evoke Grief on the first turn, but playing weak cards just to add more black cards to the deck is not something I really want to do
Green is great at getting up to big mana, and having an 11-mana Craterhoof Behemoth in the command zone is a huge advantage for any creature deck