the mad wither for 1.9 by the creeper

/summon EnderDragon ~ ~1 ~ {Passengers:[{id:Wither,CustomName:"Mad Wither",CustomNameVisible:1,Attributes:[{Name:"generic.maxHealth",Base:300},{Name:"generic.followRange",Base:500},{Name:"generic.knockbackResistance",Base:1f},{Name:"generic.movementSpeed",Base:4.6f}],HandDropChances:[2F,2F],HandItems:[{id:"minecraft:beacon",tag:{display:{Name:"Steve's first Beacon",Lore:["Dear player you are in great danger now steve is coming for you"]}},Count:1},{}]}]}