Sure, should be good for a mantainance release.
Some issues to b concerned of:
1. Dgm boosters yeild gates in common slot (someone should write a rule to filter them out, see related thread)
2. Preemptivelty make decision for optional tiggers on stack. The ui was referring to game directly, while it should get the current player controlled by gui and write the choices made to its PlayerContoller class instance.
3. Use a thread-safe collection for stack, or maybe marking getStack with synchronized keyword will be sufficint. Edt does not always know the exact number of items on stack, which results in OOB exception.
4. Get x count cannot get a not-null opponent when the game is over which results in npe.
Wish i could do any of the above by that day, but the tablet i have here is not a propper tool to write code. 
