From Serra's Realm I stab at thee
To the glorious guardian of all Vorthoses
As a planeswalker from the olden days of Serra and Urza, I simply can't support the current state of legendary rule affairs. It is nothing short of absurd, seeing both players field the same legend simultaneously.
I understand that you've had to adapt it for gameplay reasons, but frankly, it's a flavour failure. There are no true legends in the game anymore, since players are maindecking multiple copies of legendary cards and planeswalkers alike. Because they are wincons.
You could rather scrap the legendary rule altogether, and once development has found some actual ground, some real motivation for a functional legendary game mechanic, please add that instead. The legends in play today are awesome, but they are not one of a kind, they are not unique on the battlefield or in the way they affect gameplay.
Kindly,
/ Flavomancer Theo Axensköld