{
  "criteria": {
    "1": {
      "trigger": "minecraft:using_item",
      "conditions": {
        "item": {
          "items": "iron_sword",
          "predicates": {
            "minecraft:custom_data": "{colosseum_of_fools:{item:soul_nail}}"
          }
        }
      }
    }
  },
  "rewards": {
    "function": "colosseum_of_fools:player/item/soul_nail/using"
  }
}