Knowledge Soullord

{t}{x}{b}: Each player discards X cards.
{t}{x}{u}{u}{u}: Draw X cards.
{t}{x}{u}{u}{b}{b}: Put X 2/2 black Zombie creature tokens onto the battlefield tapped, then put Y 2/2 black Zombie creature tokens onto the battlefield tapped, where Y is equal to the number of cards in your hand.