The biggest thing that this new 4* restriction has done is to make me regret arena grinds.
With the 4* basic and 4* featured champs more attainable in arena, I've been grinding like a good little summoner to fill in the spots that RNG has failed to fill in.
I did this thinking 4*'s will always be usable! They'll lock out 2* and 3* champs before 4*... I'll have time to game plan!
*** sad trombone ***