Trosk, Darkdepth Crawler

Menace
Whenever Trosk, Darkdepth Crawler deals
combat damage to a player, underdraw 1 (Put the
bottom card of your library into your hand.)
On your precombat main phase, you may put a
card from your hand on the bottom of your
library. If you do, lose life equal to that card's
converted mana cost.