Well gang, there are only going to be a few more spoilers for Doomtown. We've got a pretty nice one to show you.
Horse decks have always felt like they were missing something, and maybe they still are, but Horse Wranglin' never quite felt like it was truly helping horse themed decks that much. One of the biggest problems of the archetype has always been that they don't really have shootout actions unless the come from the dudes in the shootout. If those were Morgan dudes, those abilities were probably expensive, too.
Calling the Cavalry finally gives you a shootout action that can quickly change the tide of battle. It affects Hand Ranks during resolution, but it can be played as one of your first shootout actions to make sure you get your headline in first. Each horse you have in the shootout will give you +1 hand rank for that round of the shootout. One or two horses can keep you from being beat badly by a Five of a Kind. Several more horses could spell certain doom for your opponent.
Because of how early this card plays in the shootout, it does telegraph your intentions. Your opponent could focus on trying to kick out your horses before it gets to hand ranks, or they might just try to leave if they know they can't win. If you muster enough horses into a shootout, you might just be able to guarantee hand rank 10 or more when you're only revealing a two pair.
Calling the Cavalry gives both players the hand rank bonus, so be careful when facing another horse deck, but really, how often does that happen?