Overknox, Forgotten General

First strike, deathtouch
At the beginning of each opponent's end step,
if you didn't lose life this turn, put a +1/+1
counter on Overknox, Forgotten General.
Remove all counters from this creature: until end
of turn, you may cast historic spells from your
graveyard, once each. Their casting cost is redu-
ced by {x}, where X is the number of counters
removed this way.