Missing tri-color planeswalkers, solution idea with minimal effort.

Demsu

There has been a persistant problem that is voiced by many and for a long time. We have 150+ planeswalkers but we are still missing three possible color combinations, Naya(W/R/G), Abzan(W/B/G) and Sultai(U/B/G) . The main reason we haven't had the missing tri-color planeswalkers is because officially Wizards hasn't printed them in the "main game" Magic.

But instead of waiting for whatever unforseeable future when Wizards is going to print tri-colored walkers in cardboard, what if we in this game could break or bend that rule a bit ?
Here's how it could do be done. Take couple of the existing planeswalkers and add a color identity to them.
For example:

Naya(W/R/G) - Ajani Vengeant would be a perfect fit since we have versions of him with green color and it would suit him lore and flavorwise. Additionally there
would be a chance redo and upgrade his abilities/bonuses to more up to date.

Abzan(W/B/G) - Again approaching this from lore and flavor angle, Ajani Sleeper Agent(AJ6) would be great fit. The phyrexian theme would justify adding black color here.

For Sultai(U/B/G) I suggest Tamiyo Compleated Sage. Similar to AJ6, here the phyrexian theme would justify the black color.

I don't think there is much need to change for Tamiyo's or AJ6's abilities but just to give a slight boost in mana bonuses.

There are other planeswalkers that could be treated similar fashion just for the sake of diversity in THIS game and would be chance to rework some of the weakest walkers (looking at Ob Nixilis, Sarkhan the Mad and Dovin..), like one of the Nahiri's could have black added to them to give an alternative for Dihada (depressingly weak).
This game is always going to be different from the main game and I don't think it needs to religiously follow it's cardboard version (which many cards luckily don't) so why not extend the "rule breaking" to planeswalkers too for sake of the game ?

What say you devs ?

Janosik

Buffing existing PWs that are bad doesn't sound like a terrible idea in principle, but I hate that they reworked Garruk completely for Lorwyn, and I also dislike a lot of what's been suggested here: I'd definitely hate it if they took a bad 2 color PW like Ajani Vengeant or Tamiyo Compleated Sage and converted them into a bad 3 color PW by adding a color to them... I'd much rather a new 3 color PW was created. I'd also really hate it if they took a PW that I genuinely like to play like Ob Nixilis and just changed him into something different after I'd been playing with him for years.

fenelope

Everyone agreed that the origins PWs needed buffing but I’m not sure about reworking existing PWs. I’m not a huge fan of the new Garruk for lots of reasons including the change in the number of supports allowed—he used to be a bit more playable with more than 4 supports.

Instead of carelessly changing things that I already own and sometimes use, I’d rather see new PWs created with a bit of care and thought.

Machine

I second that reworking existing PWs is not to my liking. I use a wide variety of PWs I own for PvE events, no matter how "bad" they are.