Al-Hazaharred

Whenever one or more land cards are put into a graveyard from anywhere, create a black 1/1 Assassin token with deathtouch and haste. Then each opponent loses life equal to the number of Assassins you control. You gain that much life.
{b}{b}, Sacrifice or discard a desert: Search your library for a land card and put it onto the battlefield. Then, each player puts the top three cards of his or her library into his or her graveyard.