CompositeDamageStrategy

using System.Linq;

namespace Composite
{
    public class CompositeDamageStrategy : IDamageStrategy
    {
        private readonly IDamageStrategy[] _strategies;

        public CompositeDamageStrategy(params IDamageStrategy[] strategies) =>
            _strategies = strategies;

        public int CalculateFinalDamage(int baseDamage) =>
            _strategies.Aggregate(baseDamage, (current, strategy) => strategy.CalculateFinalDamage(current));
    }
}