This game is often compared to Magic: the Gathering. Since creature in MW seems hard to kill, it would be awesome to see some dark spells (unless they exist already) like Diabolic Edict (Target Player sacrifices a creature) or Terror (Destroy target non-legendary, non-dark creature. It can't be regenerated).

I'm aware that I didn't play the game yet and maybe I'm completely wrong, but these would be super awesome.

The only problem with 2 sets is that there are only 2 player colors.  You can use pennies or tokens for action markers for 2 of the Mages. A 4-player set with green/purple will be available for purchase this fall.

Why every game designer hates colorblind people?

If it's still possible, change those colors to something easily distinguishable. Like black, white (ivory), yellow, grey etc. Green and purple could be the worst choice of all.

Wiki says:
Deuteranomaly (most common — 6% of males, 0.4% of females): These individuals have a mutated form of the medium-wavelength (green) pigment. The medium-wavelength pigment is shifted towards the red end of the spectrum resulting in a reduction in sensitivity to the green area of the spectrum. Unlike protanomaly the intensity of colors is unchanged. This is the most common form of color blindness, making up about 6% of the male population. The deuteranomalous person is considered "green weak". For example, in the evening, dark green cars appear to be black to Deuteranomalous people. Similar to the protanomates, deuteranomates are poor at discriminating small differences in hues in the red, orange, yellow, green region of the spectrum. They make errors in the naming of hues in this region because the hues appear somewhat shifted towards red. One very important difference between deuteranomalous individuals and protanomalous individuals is deuteranomalous individuals do not have the loss of "brightness" problem.

Thanks for your time.