Darklair's Kavu

Kavus you control have menace.
{1}{b}, Sacrifice a land: Reveal the top card of your library until you reveal a Kavu card. Put it into
your hand. Then, shuffle all cards revealed this
way in your library and you lose an amount of
life equal to half the cards revealed this way,
rounded down. If you don't reveal any Kavu
card this way, shuffle and you lose half your life
total, rounded down, instead.