Ornthalas, the Gloomstalker

Reach
Sneak Attack — When Ornthalas attacks with
one or more other creatures, put a deathtouch
counter on Ornthalas until end of turn. Also
when Ornthalas would have a counter put on it,
roll a d6. Add the number rolled to Ornthalas'
power until end of turn. This ability can only
trigger once per turn.