[Strenth]/Peace/Finesse a.k.a “Smoke on the Water”
Once you get two Drill Sergeants in play, max-band River to make Smoker cost 0, then play, target, bounce, and re-play Smoker an unlimited number of times to generate an unlimited number of +1/+1 runes.
Move them onto a Bird token for flying lethal, or just patrol with multiple 1000/1000 units.