builder.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace _12_Builder
{
    class Program
    {
        static void Main(string[] args)
        {
            var unitBuilder = new UnitBuilder();

            unitBuilder.WithPhysicalArmor().WithMagicalArmor().
        }
    }
    
    class UnitBuilder
    {
        private GameObject _gameObject;
        private IArmor _armor;

        public UnitBuilder()
        {
            _gameObject = new GameObject();
        }

        public UnitBuilder WithPhysicalArmor()
        {
            _armor = new PhysicalArmor();
            return this;
        }

        public UnitBuilder WithMagicalArmor()
        {
            _armor = new MagicArmor();
            return this;
        }

        public UnitBuilder MovingOnPath()
        {
            _gameObject.Components.Add(new PathMovement());
            return this;
        }

        public UnitBuilder Flying()
        {
            _gameObject.Components.Add(new FlyMovement());
            return this;
        }

        public GameObject Create()
        {
            _gameObject.Components.Add(new Health()
            {
                Armor = _armor
            });

            return _gameObject;
        }
    }


    class GameObject
    {
        public List<IComponent> Components;
    }

    interface IComponent
    {
        void Start();
        void Update();
    }

    class Health : IComponent
    {
        public IArmor Armor;
    }

    interface IArmor
    {
        int ProccessDamage(int damage);
    }

    class MagicArmor : IArmor
    {

    }

    class PhysicalArmor : IArmor
    {

    }

    abstract class Movement : IComponent
    {

    }

    class PathMovement : Movement
    {

    }

    class FlyMovement : Movement
    {

    }

}