Get 3rd first to trade on the line, upgrade it with 1 skill point
Then get Flight (2nd) and Stake (1st), but don't use skill points - save them for the ult
Once you get it, get lvl 1 and lvl 2, and then wait to max it out
Max Flight (2nd) then
After it, max Stake (1st) and lastly max Crow (3rd)
3-4-4-4-2-2-2-1-1-1-3-3