Maybe have a little button somewhere in the shape of a notepad, that details the moves the CPU opponent has taken.
Click on it, it opens up an overlay that shows you.
Turn Started – CPU has 4 coins
Plays coin – CPU has 5 coins
Plays coin – CPU has 6 coins
Plays Vicar Dubloon – CPU has 8 coins.
Plays Misinformation (5) to remove
Insert Card Here – CPU has 3 coins.
Plays Infighting (3) – CPU has 0 coins.
And so on, and so forth.
This would allow us to actually SEE what the CPU is doing on higher difficulties. As it is, games tend to get a little frustrating when the CPU goes all 3-Card Monty on you, and goes from 2 life and a dead board to 18 life and 8 critters in front of you in the blink of an eye.