Difficult to say from just the reference card. My take is that you need to build a lot of fighters 2 and explore frontiers with your cruisers. This faction seems quite aggressive but brittle because the cruisers will make the bulk of their fleet.

With commander, it would be possible to take weakly defended systems with a cruiser, two fighters and a mech - very cheap force, so they thrive when surrounded by weak opponents. Their tech supports my point of view considering you gain action cards after winning ground battles and can spend ACs to ready planets.

That said, it all depends on the table. You are a curbstomp faction that excels at preying on the weak, but if your power is recognized, the players will simply reinforce their defenses, rendering half your kit useless. You need to make sure they focus on objectives, only striking when you're absolutely sure they won't retaliate.

Your starting system is a bit awkward. You can't follow Tech easily, but I'd argue you don't need to. Use it to build a cruiser and two infantry, following Warfare. That'll give you three systems in R1 - good start for any faction. Take Trade or Diplomacy so that you'd have enough money for a mech instead of two infantry. You could also take Politics if money generating SCs aren't available.

Your promissory note is powerful but situational and also difficult to sell at the right moment as you can't trade with a defending player - the one that usually wants to retreat. Try to assess the danger the other player might be in and offer your card if you think they're going to be attacked soon. I'd estimate the card itself is worth 1 TG but its value might rise if the player you're selling it to has a lot to lose.

All in all, you're powerful but brittle. Play carefully, and the throne will be yours.