private void btnUsAttackDefend_Click(object sender, EventArgs e)
        {
            Card temp = (Card)lbxUsField.SelectedItem;

            if (temp != null && temp is Creature)
            {
                lbxUsField.Items.Remove(temp);
                if (currentPhase == GameState.phase.UsDeclareAttackers)
                {
                    Creature c = temp as Creature;
                    c.Attacking();
                    lbxAttacking.Items.Add(temp);
                }
                else if (currentPhase == GameState.phase.EnemyDeclareDefenders)
                {
                    Creature c = temp as Creature;
                    c.Defending();
                    lbxDefending.Items.Add(temp);
                }
                else
                {
                    lbxUsField.Items.Add(temp);
                }
            }
        }