Death Strider

At the beginning of your upkeep, put a starve
counter on Death Strider.
Whenever, a creature that Death Strider blocks
or is blocked by dies, remove a starve counter
from it.
If Death Strider has 1 or more starve counters
on it, it has reach and deathtouch.
If it has 3 or more starve counters on it, it has
first strike.
If it has 6 or more starve counters on it, sacrifice
it.