Hello,
this idea has been with me a while and I thought maybe it’s something you agree with.
I saw a discussion where it was said, that the “50 crystal planeswalker” are weak (especially in terms of mana gain), because they only cost 50 crystals amd that is why they stay the way they are. So this is where my idea comes in. It comes in two varieties, that both have in general the same outcome but maybe one way is less work for a programmer than the other.
So, here the idea:
Once you bought the starting planeswalker for 50 crystals you are able to upgrade them for 245 crystals (295 crystals seems to be the new prize for a mono-color planeswalker, but maybe a little bit cheaper is also okay 
). The two varieties would be that you can do that from the start (and the level progression has to be change a bit) or you are able to do that at the level of 60 (which I guess is easier to implement, but don’t count on me). For the story they could go on quest that made them more powerful or they trained/studied an became better because of that.
Both upgrade versions would have the same outcome at level 60.
Here are my suggestions for the planeswalker:
Gideon, Battle-Forged
I think his skill are fine the way they are (of course, you may object) and just his mana gains are low. After the upgrade his mana gains could be 
+0, 
+2, 
+2, 
+0, 
+4.
Jace, Telepath Unbound
New mana gains would be
+2,
+4,
+2,
+0,
+0
Jace, Telepath unbound is by a lot considered one of the worst PWs in the game and this is probably also due to his skills. So here are my suggestions for a change:
Confusion (6 loyalty)
Either
-2/-4/-6/-8 power for target creature until the beginning of your next turn
or
give -2/-3/-4/-5 power to all your opponents creatures until the beginning of you next turn.
(this would bypass hexproof, so I’m not so sure about the cost. But I leave it at 6 for now.)
Ingenuity (12 loyalty)
Either
Return the last spell cast to your hand and reduces the casting cost for 2/4/6/8 mana
or
return the 1st/2nd/3rd/4th spell(s) cast and reduce their casting cost by 1/2/3/4 mana
Mind sculpt (18 loyalty)
Create a colorless support with 3 shields and "Trap 3/4/5/6: Your opponent loses 3/4/5/6 mana
Chandra, Roaring Flame
Same procedure.
+2,
+4,
+2,
+0,
+0
Liliana, Defiant Necromancer
Also, only the mana gain changes.
+2,
+4,
+2,
+0,
+0
Nissa, Sage Animist
Nissa is a little bit trickier, because even though her summed up mana gain is substandard, with green’s ramp ability she can do well. So I would only raise the adjacent color gain and work on there abilities. So, her final mana gain would look like this:
+2,
+3,
+2,
+0,
+0.
Nature’s Bounty
I would leave her first ability as it is.
Nature’s Gift
I read that her skill is not as good as the others because it is not permanent and costs a lot, so I would reduce it’s cost to 12.
Nature’s Regrowth
Convert 10/15/20/25 gems to green and gain 5/10/15/20 life. (I think that the life gain is not to much for 24 loyalty. What to you think? Is that to much, okay or even too low?)
So far, these are my ideas for the starting planeswalker. Of course this could be done to others as well. For example, as a perspective:
Liliana, The Last Hope
For 400 crystals she gains the blue color and is a dual-color planeswalker (I think with the zombie theme this would be great because blue also has zombies)
Okay, I’m curious about your opinion. 
Regards!
Sven
Edit: Updated the starting PW cost from 10 to 50 crystals
Edit: Add ideas for Jace, Telepath unbound skills
