This is my first deck submittal. I've benefitted greatly from the other posters here. So I'm sharing my cheap successful Gauntlet grinder. I win probably 70% of the matches. With the AI consistently throwing Legendary bombs at me.
The AI can't really assess risk. It plays a form of chess. So to stack the deck against you. It power/unit floods you.
Pledge units and transmute powers play the AI against itself when assigning your busted starting hand. 6 whatever and one power card is a normal first draw in masters Gauntlet.
So if I get one power and one pledge unit I'm less likely to mulligan. If one of the cards in my starting hand is a +1 power as well. I can usually keep up with the AI and outlast it's perfect starting hands.
The rest of the deck has a little bit of everything. To outlast and then overwhelm the AI.