Gurthang, Ill-Fated Blade

Whenever equipped creature attacks, put a
despair counter on it, then you lose 1 life. At the
beginning of your endstep, 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}