So...about Hallucination, and...Hellfire, is it called?(Entropy's and Fire's champion skills) and and other automatic area of effect skills. I think there are a couple problems with them. First, I don't believe they should affect allies. Otherwise, these to elements will become very isolated, once those players start getting their champion's skill. I certainly wouldn't want someone who produces infighting or discarding whenever they get close to me as an ally.
Second, the ever present issue of balancing.
I'm not entirely sure that Hellfire is strong enough. Sure, it sounds impressive at first, making enemies discard every turn for nothing. But is three cards per turn really very strong when you actually want to use it? I'm not sure it's worth the trade off of making enemies. Comparing that to Darkness' Tier 1 skill, Backstab, it's actually pretty weak(I know Backstab requires that you win 2-0, but it also makes your opponent lose twice as many cards as a champion ability).
Hallucination, on the other hand, seems to be too strong, in one specific situation, siege. Think about it. Every round, they can kill half the defenders. Automatically. No difficulty. Granted, they might die that same round, but as it only takes one Entropy Champion, all they need are maybe five champions, and they'll be able to decimate the enemies armies all by themselves.