I'll save you hours of frustration... the computer has predetermined draws!!! Level 6 for ground, the computer always starts with a ground egg and enough power-ups to increase strength to 5 on their first turn. Then they turn the egg to basic on their next turn... a few turns later they're slamming you with 8 damage per turn on ground. A few turns later they have a 14+ damage hitter on the board. Regardless of what deck you choose you cannot counter it. I played the same stage over 15 times with the same results.
 "D-Evo"){kind=icon}
 "Kill the Heroes"){kind=icon}