{
  "generation": {
    "overworld_spawn": [
      {
        "object": {
          "type": "block",
          "name": "minecraft:mob_spawner",
          "nbt": {
            "S_id": "MobSpawner",
            "s_delay": 0,
            "S_EntityId": "Blizz"
          }
        },
        "weight": 10
      }
    ]
  }
}
