YGOProUnity_V2/Assets/ArtSystem/gameInfo/priority_floating.cs

using UnityEngine;
using System.Collections;
using System;

public class priority_floating : MonoBehaviour
{
    int open = 0;
    // Use this for initialization
    void Start()
    {
        open = Program.TimePassed() - UnityEngine.Random.Range(0, 500);
    }

    // Update is called once per frame
    void Update()
    {
        gameObject.transform.localPosition = new Vector3(0, 10*(float)Math.Sin(3.1415936f * (float)(Program.TimePassed() - open) / 500f), 0);
    }
}