Player.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Player : MonoBehaviour {
	public Hand hand;
	public Field field;

	public void PushSettingCardOnFieldFromHand(){
		Card card = hand.Pull(0);
		field.Add(card);		
	}
}

Field.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Field : MonoBehaviour {
	public List<Card> cardList = new List<Card>();
	public void Add(Card _card){
		_card.transform.SetParent(this.transform);
		cardList.Add(_card);
	}
	public Card Pull(int _position){
		Card card = cardList[_position];
		cardList.Remove(card);
		return card;
	}
}

Hand.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Hand : MonoBehaviour {
	public GameObject cardPrefab;
	public List<Card> cardList = new List<Card>();

	void Awake () {
		for(int i=0; i<5 ; i++){
			GameObject cardObj = Instantiate(cardPrefab);
			Card card = cardObj.GetComponent<Card>();
			this.Add(card);
		}
	}
	void Add(Card _card){
		_card.transform.SetParent(this.transform);
		cardList.Add(_card);
	}
	public Card Pull(int _position){
		Card card = cardList[_position];
		cardList.Remove(card);
		return card;
	}
}

Card.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Card : MonoBehaviour {	
}

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