d20

Roll a D20 If: ~1,2 - You Lose the game ~3,4 - A creature dies ~5,6 - lose 1 life ~7,8 - roll again ~9,10 - nothing ~11,12 - one creature gets +1/+1 ~13,14 - lose half your health ~15,16 - make a copy of every creature ~17,18 - play one card free of mana cost from your hand ~19,20 - You win the game