Potion of Chance

Flip a coin. If heads, give a creature you own Luck (If blocking, flip a coin. If heads, the attacker deals no damage) If tails, give a creature you own Unluck (If blocking, flip a
coin. If heads, the attacker deals double damage)
"A Four leave clover, a rabbits foot, made on Friday the 13th, this is how to make a potion of chance"