Thank you, Izaya.
I was afraid those skills might be hard for some people to grasp, but I'm glad you like them.
I think Dark Illusion would cause opponents a very hard time. We plan our hands and strategies based on the amounts of quanta, HP, ATTK, etc. Playing without them is like playing with a blindfold on.
Shadow illusion would be useful to hide your creatures' identity (surprise attack!). If you already have Shadow Avatar on the field, when you place a new creature, your opponent doesn't know what it is. For all they know, it's just another Shadow avatar. Maybe your opponent has Maxwell and wants to use Paradox. But, he has no way of knowing which one of your creatures to target. Or, maybe, you've used some spells to boost one of your creatures ATTK. Naturally, your opponent would want to kill it, but s/he doesn't know which one is causing all that damage! In addition, Shadow illusion affects "all creatures," so your opponent gets confused over his/her own creatures too. You get the idea. Your opponent's head is spinning, and with the clock ticking, he'd have to play his hands in the dark.
