KillerproductionsHD 10 Secret Commands With Command Blocks
All codes are all below!
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Zombie Horse Tamed - /summon EntityHorse ~2 ~ ~ {Type:3,Tame:1}
Zombie Horse Untamed - /summon EntityHorse ~2 ~ ~ {Type:3}
Skeleton Horse Tamed - /summon EntityHorse ~ 2~ ~ {Type:4,Tame:1}
Skeleton Horse Untamed - /summon EntityHorse ~2 ~ ~ {Type:4}
Giant - /summon Giant ~2 ~ ~
Ender Crystal - /summon EnderCrystal ~2 ~ ~
Spawners - /setblock ~2 ~0 ~0 minecraft:mob_spawner 0 replace {EntityId: Zombie}
All Mobs Spawn - /setblock ~0 ~1 ~1 mob_spawner 0 replace {EntityId:Zombie,SpawnRange:6,RequiredPlayerRange:12,SpawnCount:1,MaxNearbyEntities:6,MinSpawnDelay:100,MaxSpawnDelay:600,SpawnData:{Equipment:[{id:268,Count:1},{id:301,Count:1},{id:300,Count:1,tag:{display:{color:5013401}}},{id:299,Count:1,tag:{display:{color:6717235}}},{id:397,Count:1,Damage:3,tag:{SkullOwner:Reimac}}]},SpawnPotentials:[
{Type:Zombie,Weight:4,Properties:{Equipment:[{id:268,Count:1,Damage:58},{id:301,Count:1},{id:300,Count:1,tag:{display:{color:5013401}}},{id:299,Count:1,tag:{display:{color:6717235}}},{id:397,Count:1,Damage:3,tag:{SkullOwner:Reimac}}]}},
{Type:Skeleton,Weight:2,Properties:{Equipment:[{id:267},{id:301,Count:1,tag:{display:{color:1644825}}},{id:300,Count:1,tag:{display:{color:1644825}}},{id:299,Count:1,tag:{display:{color:1644825}}},{id:397,Count:1,Damage:3,tag:{SkullOwner:2insanepeople}}]}},
{Type:Zombie,Weight:4,Properties:{Equipment:[{id:272,Count:1},{id:305,Count:1},{id:304,Count:1},{id:303,Count:1},{id:397,Count:1,Damage:3,tag:{ench:[{id:0,lvl:2}],SkullOwner:Flixnore}}]}},
{Type:Zombie,Weight:4,Properties:{Fire:2400,Equipment:[{id:283,Count:1,tag:{ench:[{id:20,lvl:1}]}},{id:317,Count:1},{id:316,Count:1},{id:315,Count:1},{id:86,Count:1,tag:{ench:[{id:0,lvl:2},{id:1,lvl:10}]}}]}},
{Type:Zombie,Weight:4,Properties:{Equipment:[{id:267,Count:1,tag:{ench:[{id:16,lvl:2}]}},{id:309,Count:1},{id:308,Count:1},{id:307,Count:1},{id:397,Count:1,Damage:3,tag:{ench:[{id:0,lvl:2}],SkullOwner:2zqa}}]}},
{Type:Zombie,Weight:1,Properties:{Equipment:[{id:278,Count:1,tag:{ench:[{id:16,lvl:4},{id:17,lvl:4},{id:18,lvl:4},{id:21,lvl:3},{id:34,lvl:3}]}},{id:313,Count:1,tag:{ench:[{id:1,lvl:4},{id:2,lvl:4}]}},{id:312,Count:1,tag:{ench:[{id:3,lvl:4}]}},{id:311,Count:1,tag:{ench:[{id:0,lvl:4}]}},{id:397,Count:1,Damage:3,tag:{SkullOwner:MHF_Herobrine,ench:[{id:0,lvl:4},{id:1,lvl:4},{id:3,lvl:4},{id:5,lvl:3},{id:6,lvl:1}]}}],CustomNameVisible:1,CustomName:Herobrine,PersistenceRequired:1}},
]}
EnderDragon - /summon EnderDragon ~-20 ~ ~

Resourse - http://minecraft.gamepedia.com/Tutorials/Command_Block#New_1.7_uses