Ill be short.
So when hallucination is played, the oponent must discard FLUcombat card and replace it with new from his hand or draw top of the deck.
1. If oponnent knows , the Hallucination is the only tech you ressearched for Templars, it can be quite exploitable.
2. Lets say there is a skirmish with prottos having templar as support with hallucination vs some random enemy unit. Lets say the protoss kills the enemy unit, and does not lose his own unit. But when hallucination is played, enemy can then switch his combat card and swap it with some, that he actualy kills protoss unit.. We all know there are defensive and offesnive combat cards, like zealot 5a7h and 7a5h. So do you see where is problem?
Rules doesn't say anything specific about this, meaning that Hallucination must be played, and Protoss player can not decide either he plays it or not. Although would be great, if protoss player could decide, if he wants to play Hallucination or not. If hes succesfull in skirmish (kills enemy unit, does not lose his own) then he can just discard the card, if hes not , then he plays it. Is there a houserule on this? Otherwise this tech seem just a waste of resources, untill you have PSI storm ressearched too, to mix it up.
What do you think?