Umbral Corruption

When Umbral Corruption enters the battlefield, double the amount of "Umbral Tendril" creature tokens on the battlefield. When a constrict counter is placed on a creature, create a 2/4 "Umbral Tendril" creature token with "As long as you control this creature, creatures you control named 'Azazel Xol, Umbramancer' take halved damage."
If you control ten or more "Umbral Tendril" creature tokens, you win the game.
Let the darkness take you over... stop resisting.