Activate Krav by paying ({B} magic symbol) and sacrificing all Armies you control, or one other creature if you don't control an Army.
When the sacrificed creature(s) die, Pitiless Plunderer triggers that many times, creating that many Treasure tokens.
Resolve Krav's ability, causing an opponent to draw a card and gain 1 life for each creature sacrificed this way, and for you to put that many +1/+1 counters on Krav.
Orcish Bowmasters triggers for each card drawn this way, dealing that much damage to any target and causing you to gain that much life, then creating a 0/0 Orc Army creature token and put a +1/+1 counter on it for each card drawn.
Activate a Treasure by tapping and sacrificing it, adding ({B} magic symbol) .