Gurthang, Ill-Fated Blade

Whenever equipped creature attacks, put a
despair counter on it, then you draw a card and
lose 1 life. At the beginning of your end step, if
there are four or more despair counters on it,
sacrifice equipped creature.
Equipped creature gets +X/+0 where X is the
number of despair counters on it, and has first
strike, vigilance and deathtouch.
Equip {4}