Hardened Assassin

Hardened Assassin enters the battlefield with
three deathtouch counters on it.
Whenever Hardened Assassin blocks or becomes
blocked by a creature, you may remove a
deathtouch counter from Hardened Assassin. If
you do, destroy that creature.
{3}{b},{t}: Put a deathtouch counter on Hardened
Assassin. Activate only as a sorcery.