Land Of The Zombies

Whenever a zombie enters the battlefield under your control, add {b} to your mana pool.
{t} Tap up to X target zombies you control, target opponent reveals X cards from their hand. Then, you may sacrifice Y zombies, you may choose up to Y +1 cards, they discard those cards.
Zombies are not useful for their brains, but they are good at picking through any other person's.