Originally Posted by
Gondorian
Whilst simple to implement, this WILL affect balance and the meta.
I think if you're going to bring this in, then you should also increase the minimum deck size to 50. Otherwise, it improves consistency too much and throws off the balance. With an increased minimum and a mulligan then you will both help and hinder consistency, at the same time increasing variety and reducing the probability of clumping.
How about we do a PUBLIC TEST with Mulligan and 50-card minimum together? Just have it as an option in Custom Match. The community will give feedback and we go from there.