Ichor, the Troll Prince

When Ichor, the Troll Prince enters the battlefield, choose one -
*Undergrowth - Creatures that dont share a color with Ichor, the Troll prince get -X/-X until end of turn, where X is the number of creatures in your graveyard.
*Undergrowth - Create X 1/1 black Insect creature tokens where X is the number of creatures in your graveyard.