This is a deck that's revolved around Ghost's ability to delay our on reveal effects. In this guide I'll walk you through the essemtial cards and how you usually want to play the deck.
First we'll start with the essential cards:
Ghost- Ghost is the main card in our deck since our deck is revolved around her ability to delay our on reveal effects is really powerful with cards such as Hazmat, Leader, Killmonger, Spider Woman and Valkyrie without giving up on having priority.
Luke Cage- Luke is another great card for this deck since he can negate some of the downsides for our cards while still affecting our opponent. His synergy with Hazmat and Valkyrie is great since he'll make it so only our opponent's cards have their power reduced while our units will retain the same power. He's also great with Lizard and Mary since his effect prevents them from having their power reduced.
Leader- Leader is an incredible card to synergise with Ghost because Leader works best without having priority. The way Leader works now makes it so he'll copy units with the highest power. So if you do have priority and the unit is unrevealed he'll pick the unit with the highest base power, this can be fine even if you do have priority but it's a lot worse if your opponent plays ongoing units such as Knull, Devil Dino, Dark Hawk etc.
So Ghost negates that potential downside by always making it Leader doesn't have priority thus making him always copying the highest power unit.
Valkyrie- Valkyrie is extremly powerfull with Ghost because even if you do have priority her effect will always trigger last thus guaranteeing you'll always reduce your oppoent's cards power to 3. And since we have Luke Cage in our deck our units with more than 3 power won't have their power reduced thus making sure Valkyrie will capture a location for us.
The way you want to play this deck is to usually prioritize playing your high power units first so we'll make sure we always have priority thus making our Ghost plays much harder for our opponent to predict our plays. If you don't draw Luke Cage that's fine as long as you have priority and Ghost since we can still outmuscle our opponent with our units' base power, we also do run Enchantress which does help since she can disable both Lizard and Mary in case we don't draw Luke. Just make sure you don't play Ghost or Luke into the same location as them so you can use Enchatress if needed.
If you don't have Valkyrie you can replace her with Shang Chi but it's a lot weaker but it's still possible. The rest of our cards (other than the essential ones) are just good value cards which can be replaced. Hood is great since he gives us a Demon and we can destroy his with Killmonger or boost his power with Valkyrie. Polaris is good since she has high base power and can help us moving cards to free your Lizard location, set up a location for future Valkyrie turn or set up a location for Spider Woman.
Killmonger is great against swarm decks such as Kazar, Patriot/Ultron and Thanos because even if your opponent tries to play around KM by not having priority KM will still destroy his board if he's played with Ghost. It's best to save that play for the last turn (if possible) because KM will destroy Ghost as well.
Thank you for reading my guide and I hope you'll have fun with the deck.