Dralnu's Crusade

Under Dralnu's Crusade, Goblins are black only, not black in addition to any other colors. They are, however, Zombies in addition to their other creature types. As one enters the battlefield, it is already a black Goblin Zombie (and perhaps some other creature types) with +1/+1; it doesn't enter and then become a black Goblin Zombie and get +1/+1.