DBA/Scott - I like them in an El Nino year and I like them as an inflation hedge.
You can sell the Jan $22 puts for $1 and use that to buy the $21/23 bull call spread for $1 and that's a free chance at $2 (assuming you don't mind owning DBA at net $22). TOS says 0.40 of margin so a very efficient way to make $2.