Spiritualize Magic The Gathering Card

on the 2nd turn, this killer deck can deal atleast 20 damage to target opponnet.all you have to do is on your first turn play a plains and play tireless tribe and, on your second turn play a mountain and discard 5 cards to make tireless tribe a 1/21 creature and play about face which makes tireless tribe a 21/1 creature. this early in the game its hard sometime to have a creature or counter spell to help you at this point, so usually the opponet takes the damage and you automatically win. but the question arrisses what if i dont get either card in my hand or not the required mana? thats why i have walls and other quick 1/1 creatures to protect and kill defenders until you can either get this awesome combo into play or get the bigger creatures and power ups into play.