Koshigan, The Wargrave

Flying, deathtouch, lifelink
Whenever Koshigan, The Wargrave blocks or
attacks a creature, it becomes indestructible until
end of turn.
At the beginning of each endstep, for each
creature dealt leathal combat damage this turn,
put a +1/+1 counter on Koshigan until the end
of the turn.