Sandman

Flying, dreamborn (This spell costs {1} less to cast for each tapped creature you control.)
{1}{u}: Create an aura enchantment token called Dream that has "Enchanted creature gets +1/+1 for each tapped creature you control and gains flying."
{1}{b}: Create an aura enchantment token called Nightmare that has " Enchanted creature gets -1/-1 for each tapped creature you control."