Slot machine Spawner

/give @p mob_spawner 1 0 {BlockEntityTag:{EntityId:FallingSand,SpawnData:{Block:barrier},MaxNearbyEntities:0s,RequiredPlayerRange:5s,SpawnCount:1s,Delay:-200s,MinSpawnDelay:-200s,MaxSpawnDelay:-200s,SpawnRange:0s,SpawnPotentials:[{Type:MinecartSpawner,Weight:1,Properties:{Pos:[0d,-1000d,0d],EntityId:Giant,SpawnData:{Rotation:[0f,0f],Equipment:[{},{},{},{},{id:iron_helmet}],DeathTime:19s}}},{Type:MinecartSpawner,Weight:1,Properties:{Pos:[0d,-1000d,0d],EntityId:Giant,SpawnData:{Rotation:[0f,0f],Equipment:[{},{},{},{},{id:golden_helmet}],DeathTime:19s}}},{Type:MinecartSpawner,Weight:1,Properties:{Pos:[0d,-1000d,0d],EntityId:Giant,SpawnData:{Rotation:[0f,0f],Equipment:[{},{},{},{},{id:diamond_helmet}],DeathTime:19s}}}]}}