0 In the new update I think 1.8 - 1.12 (now) there is no way to stack mobs, there is passenger but if you try more than one mob they get stuck together and I am hoping there is a command out there that will stack higher and not smoosh mobs. minecraft-java-edition mine...
a fishing rod named "Snowball Bazooka"), and if the player is holding said fishing rod, then it will summon a snowball or some other projectile above all the mobs except for the player in a radius of about 10 blocks.