The RW signpost uncommon wants you to attack with exactly two creatures. With the Cavalry and another creature with higher power, you get at least 8 damage in the air. The rest you can hold back for defense.
The card doesn't say anything about attacking. Up to 2 target creatures get +1/+0 at the beginning of your combat. You get to choose which two, if you have more, and they don't actually have to be attacking to receive the buff.
How i feel about competitive players and casual players in EDH: The competitive are german tourists, the casual are italian tourists, both in a italian beach. The italians asking themselves "why are the germans here?" make a legitimate question, the answer is because the beach is beautiful, no matter the country you came from. The italians wanting to ban the germans are dumb, because if the germans pay for their stay and follow the rules like everyone else, they have the right to be in the beach. Hovewer, if the germans started to ask themselves "why are the italians here?"... they would be dumb as hell.
It is strange, and it doesn't fit at all. We've had vampires in Orzhov and Rakdos and Dimir too, but what is a Boros Innistradi vampire like? Crazy because of the Red, but restrained because of the White? Like the vampire version of Gomez Addams, an eccentric? Cuts your hand with a talon, and after taking a sip, presses a handkerchief into your palm and apologizes?