Lord of Deep Shadow

Players can't gain life.
{b}{b}: The next time you would take damage
from a black source, prevent all but 1 of that
damage.
{p/b}{p/r}{b/r}: Create a 5/5 legendary red and black
Demon Lord named Patron of the Abyss with
flying and "{t}: Deal 3 damage to any target. If
that target is a player, they draw 2 cards."