Twitch, The Plague Rat

Deathtouch, hexproof
{3}{b}{b}: Twitch, The Plague Rat becomes unblockable until end of turn.
You may mill instead of draw on your turn if you
do take damage equal to the mana cost of the
milled card, you may cast that card for a {b} if you
do not, take 1 damage, and deal damage equal to
Twitch, The Plague Rat's power plus the mana
cost of the milled card.