You CAN Play Type I #61: Opening Up Onslaught, Part II (Red, Green and Black Creatures)
No deck that can handle the double-black mana cost has wanted a four-mana slot since Phyrexian Negator, anyway. Ben Bleiweiss called Grinning Demon”Juzam Djinns five through eight,” and that sums it up nicely – albeit in exactly the opposite way Ben intended.