For todays Hard Trial.
First thing that you must focus on doing in this trial is to clear your opponents board using removal spells/ether pumps/charge coils. Once this is done and you have good control of the board you can focus on idols. The easiest ways to get the an idol early on is with an oculos cannon, you probably won't need to use overdrive on it as the AI wants you do hurt yourself with unground and you move in to its path. Be sure not to play too many structures as you don't want your oculos too strong that you kill all your structures. The best way to pick off the last idol is with a solemn giant to pick off an 8 health idol without regard to unground.
-This deck is in no way a guaranteed win for todays Hard Trial.
Also beat the trial with this stupid deck I made in 1 minute http://scrolldier.com/deck/1549
Electrify Corrode is another good idea (stolen from Ironballs :P)
You can beat the trial with this deck http://scrolldier.com/deck/1551 but..... its really boring as the only win condition is beetle stones. If you take out nog nest/other useless structures and add in decimations and burns (for the piercing and machinated units) you should be able to beat the trial easily enough. Gameplay -------> http://i.imgur.com/uqxAD71.png