Lol wut? Nonono, I don't think that's going to happen
It sounds ridiculous.. but wouldn't it be fun?
"Hey, let's have a mode in which the rich get richer, and skill is rarely seen" is a simpler version of your suggestion.
I don't know about Elo, It would become too exclusive. Not everybody has Guru Kiki Lyse graks jackie etc.
But i do think think that this could be implemented in colliseum.
Guru kiki lyse... all of them are strong cards... but most of the banned cards doesn't cost more than 100k clintz
And they still have to follow the star limit (25)... so it would be fun.. i think....
Ahem.. Deathmatch Ext. 25 much? Minus the bit higher life total, but in purest essence.
Never played deathmatch ext 25 O_o... i just got back from half a year inactive...
"And they still have to follow the star limit (25)... so it would be fun.. i think...."
No, that won't change anything. Everybody who has them will still be using nothing but Jackie cr, Zatman, Uranus and Graksmxxt, except this time their allies will be low star cards instead of Kolos, Ambre, Dorian and some other 4 or 5* fillers.