Limited Number of Units

The fact that in this game of complete rng, it's possible for a unit to stop showing up in the shop because too many people purchased it is so fucking stupid. Like I cannot actually get over that. I sit on 2 2-stars and 2 copies of like 3 units just waiting for their clones but because billy bob jim over there has one two-star of the same unit, I'm now forever locked out of it? And I have to look and notice that before they get wiped out and their heroes hidden in order to see that, or else I'll never know? Holy SHIT this game mode is so bad. I was hyped as fuck for it until I learned that every single thing about it is RNG and there's a limited number of each thing.

And you guys want to do a ranked version of it. L O L.