MobSpawners

► Rocket powered exploding TNT spawner with possible firework effects of a large red ball or a orange star (3:1 ratio). The first firework effect will be a light blue creeper head (one time only). Firework rocket will spawn within 1 block of the spawner one at a time at a rate of between ~2 second and ~5 seconds. The spawner is activated when the player is 3 blocks away or less.

/setblock ~ ~1 ~ minecraft:mob_spawner 0 replace {EntityId:PrimedTnt,SpawnData:{Fuse:15,Riding:{id:FireworksRocketEntity,Motion:[0.0,0.7,0.0],LifeTime:15,FireworksItem:{id:401,Count:1,tag:{Fireworks:{Explosions:[{Type:3,Colors:[1499900]}]}}}}},SpawnPotentials:[{Type:PrimedTnt,Weight:3,Properties:{Fuse:15,Riding:{id:FireworksRocketEntity,Motion:[0.0,0.9,0.0],LifeTime:15,FireworksItem:{id:401,Count:1,tag:{Fireworks:{Explosions:[{Flicker:1,Type:1,Colors:[16711680]}]}}}}}},{Type:PrimedTnt,Weight:1,Properties:{Fuse:15,Riding:{id:FireworksRocketEntity,Motion:[0.0,1.1,0.0],LifeTime:15,FireworksItem:{id:401,Count:1,tag:{Fireworks:{Explosions:[{Type:2,Colors:[14384446]}]}}}}}}],SpawnCount:1,SpawnRange:1,RequiredPlayerRange:3,MinSpawnDelay:40,MaxSpawnDelay:100,MaxNearbyEntities:1}

► Instant health spawner providing instant health to a player who is within 3 blocks of the spawner at the rate of 1 health bonus per ~1 second.
/setblock ~ ~1 ~ minecraft:mob_spawner 0 replace {EntityId:ThrownPotion,SpawnData:{potionValue:8197},SpawnPotentials:[{Type:ThrownPotion,Weight:1,Properties:{potionValue:8197}}],SpawnCount:1,SpawnRange:1,RequiredPlayerRange:3,MinSpawnDelay:20,MaxSpawnDelay:20,MaxNearbyEntities:1}

► Baby cow, sheep and wolf spawner spawning animals within 10 blocks of the spawner at a rate of 3 every ~2 to ~5 seconds up to 15 animals. Animals will only spawn on grass blocks. The spawner is activated when the player is within 32 blocks.
/setblock ~ ~1 ~ minecraft:mob_spawner 0 replace {EntityId:Cow,SpawnData:{Age:-999999},SpawnPotentials:[{Type:Sheep,Weight:1,Properties:{Age:-999999}},{Type:Cow,Weight:1,Properties:{Age:-999999}},{Type:Wolf,Weight:1,Properties:{Age:-999999}}],SpawnCount:3,SpawnRange:10,RequiredPlayerRange:32,MinSpawnDelay:40,MaxSpawnDelay:100,MaxNearbyEntities:15}

► Baby pig zombie spawner with the pig zombie riding a saddled pig and holding either an iron sword or a knockback 1 gold sword (2:1 ratio). Up to 10 pig zombies will spawn one at a time randomly between ~5 seconds and ~10 seconds apart within a 5 block radius of the spawner. The spawner is activated when the player is within 32 blocks.

/setblock ~ ~1 ~ minecraft:mob_spawner 0 replace {EntityId:PigZombie,SpawnData:{IsBaby:1,Riding:{id:Pig,Saddle:1},Equipment:[{id:267}]},SpawnPotentials:[{Type:PigZombie,Weight:2,Properties:{IsBaby:1,Riding:{id:Pig,Saddle:1},Equipment:[{id:267}]}},{Type:PigZombie,Weight:1,Properties:{IsBaby:1,Riding:{id:Pig,Saddle:1},Equipment:[{id:283,tag:{ench:[{id:19,lvl:1}]}}]}}],SpawnCount:1,SpawnRange:5,RequiredPlayerRange:32,MinSpawnDelay:100,MaxSpawnDelay:200,MaxNearbyEntities:10}

► Skeleton spawner that spawns one named guard which never despawns wearing gold protection 2 armor and a power 5 bow. Other skeletons spawn with a power 3 bow. All skeletons spawn with the player head of stormfrenzy. Skeletons spawn within 5 blocks of the spawner and when the player is within 32 blocks. Spawn rate is 2 skeletons every ~5 seconds to 10 seconds up to 10 skeletons within the spawn area.

/setblock ~ ~1 ~ minecraft:mob_spawner 0 replace {EntityId:Skeleton,SpawnData:{Equipment:[{id:261,tag:{ench:[{id:48,lvl:5}]}},{id:317,tag:{ench:[{id:0,lvl:2},{id:1,lvl:2},{id:3,lvl:2},{id:4,lvl:2}]}},{id:316,tag:{ench:[{id:0,lvl:2},{id:1,lvl:2},{id:3,lvl:2},{id:4,lvl:2}]}},{id:315,tag:{ench:[{id:0,lvl:2},{id:1,lvl:2},{id:3,lvl:2},{id:4,lvl:2}]}},{id:397,Damage:3,tag:{SkullOwner:"stormfrenzy"}}],CanPickUpLoot:1,PersistenceRequired:1,CustomName:"Guard",CustomNameVisible:1},SpawnPotentials:[{Type:Skeleton,Weight:1,Properties:{Equipment:[{id:261,tag:{ench:[{id:48,lvl:3}]}},{},{},{},{id:397,Damage:3,tag:{SkullOwner:"stormfrenzy"}}]}}],SpawnCount:2,SpawnRange:5,RequiredPlayerRange:32,MinSpawnDelay:100,MaxSpawnDelay:200,MaxNearbyEntities:10}