As long as you control an enchantment, Blood-Cursed Knight gets +1/+1 and has lifelink. (Damage dealt by this creature also causes you to gain that much life.)
"The bloodlust shall not control me, for my oath is my greatest compulsion."
If you cast an Aura spell targeting a creature controlled by an opponent, you still control that Aura. It will count for Blood-Cursed Knight’s ability.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.