I’d rather have the board shake. I’m assuming the 3x3 section destroyed is random, like similar effects on cards?
4 damage would have it be extremely powerful - almost every dangerous high cost nonfatty is 4 health, presumably because chandra’s nukes usually do 3 damage. So 4 would have made that ability much better.
Flameshot damages the enemy planeswalker. Scorching Strike damages creatures, and I would absolutely love having a 4 damage SS. The 3->4 difference on Flameshot is pretty negligible. The 3->4 difference on SS would be huge.
Oh I thought that is what we were complaining about.
IIRC the rank 3 scorching strike instead hits all enemy creatures for 3 (going off of the level 50 challenge Chandra), which is decent, but not as good as a 4 nuke. Oh well.
Little bit off topic but does gideon ever get to have 5 supports? Theres a card specifically for having 5 or more supports and from what I’ve seen he can only have 4.
Pretty sure (99.999%) I got a regen upgrade on Nissa at level 11. And I think HP at 12.
-ignore this-
Doin’ this for you guys and in the name of research.
Chandra 39-> 40 - Regeneration
Chandra 40-> 41 yields: +4 HP
Chandra 41->42 yields: +1 Mana on 
matches.
(at 42 I have 66 max HP, Flameshot rank 3 (3 damage to enemy Planeswalker + destroy 1 random 3x3), Scorching Shot rank 2 (3 damage to target creature) and rank 2 Fireball (10 damage to enemy Planeswalker + destroy 2 random 3x3s))
Bonus mana on match at 42:
+1 
| +1 
| +2 
| +0 
| +0
Cards per deck at 42:
8 total Creatures allow; 7 total Spells allowed; 3 total Supports allowed.
Dunno if that helps anyone.
TL;DR all stats provided above are for Chandra.
Liliana Level Progression:
level 1: 26 HP, 5 creatures / 3 spells / 2 supports maximum per deck
Level 1->2
Corrupt level 1 (both players destroy the last card in their hand)
Level 2->3
+4 max HP
3->4
+1 max supports
4->5
+4 max HP
5->6
+1 max creatures
6->7
+4 max HP
7->8
Corrupt level 2 (you destroy 1, they destroy 2)
8->9
+1
Mana on match
9->10
+1 max spells per deck
10->11
+4 max HP
11->12
+bonus regeneration
12->13
+1 max supports per deck
13->14
Grave Mist level 1 (Activate 3. Deals 1 damage to all creatures and Planeswalkers.
14->15
+4 max HP
15->16
+bonus regeneration
16->17
+1
Mana on match
Summary @ level 17:
-1
-1
+0
+2
+1
46 max HP
6 max Creatures, 4 max Spells, 4 max Supports
Rank 2 Corrupt, rank 1 Grave Mist.
I can verify these, since I’ve started keeping notes with each level gain. Also, 42->43 give +1 support to your deck.
I’ll keep logging the upgrade ladder on my phone and post what I find from time-to-time. I’m planning on taking Chandra to 50. There may be better Plainswalkers, but I’ve come so far and I can obsess about these things. 
This is the problem with getting in on the ground floor-- nobody’s had time to build a wiki yet. 
Liliana @ 28 is increased HP regen
Jace
??? xp to go 18->19 Increased Regen
??? xp to go 19->20 Ingenuity lvl 2
740 xp to go 20->21 HP +4
770 xp to go 21->22 Increased Regen
805 xp to go 22->23 HP +4
840 xp to go 23->24 +1 spell
870 xp to go 24->25
Feel free to edit your original post.
Thanks for Verifying:
Nissa,
11 Regen improved
12 Regen improved (seriously)
13 HP +4
Nissa
Level 31: HP +4
Gideon (confirmed)
Level 3: Regen improved
Level 4: HP +4
Level 5: +1 Creature to Deck
Jace 33–>34 Ups regen
Jace 34–>35 Ups regen
Sorry, didn’t track the rune costs.
Chandras final levels:
L43 → +1 Support to your deck
L44 → L3 Scorching Strike
L45 → Regeneration Rate Increased
L46 → HP +4 (Total: 70)
L47 → +1 Creature to your deck
L48 → HP +4 (Total: 74)
L49 → Regeneration Rate Increased
L50 ->Fireball level 3! (Deal 10 damage to your opponent and destroy 2 blocks of 5x5 gems.)
Final Stats:
HP: 74
Deck: 9 Max Creatures, 8 Max Supports, 4 Max Spells
: 1
: 1
: 2
: 0
: 0
Not sure if someone else confirmed it but since it’s still orange\red in the google doc I can confirm that:
Chandra lv24 → +4 HP
Chandra lv25 → Improved Regen
Chandra lv26 → +4 HP
Chandra lv28 → +1 Spell
Chandra lv29 → White Match +1 Mana
Chandra lv30 → Improved Regen
Chandra lv31 → +4 HP [Highlighting this because it’s totally blank in the doc]
@EDIT: Since this is also missing in the doc:
Nissa LV3 → Improved Regen
Nissa LV4 → +4HP
Jace
Level 28: Blue match gets one more mana
Liliana
lvl 29 → +1 support
lvl 30 → HP+4
lvl 31 → Increased Regen
lvl 32 → HP+4
lvl 33 → Raise Dead lvl 2
lvl 34 → Red Match +1 Mana
lvl 35 → Increased Regen
lvl 36 → HP+4
lvl 37 → Green Match +1 Mana
lvl 38 → Corrupt lvl 3 (9) Destroy Last 2 cards in your hand and your opponent destroys the first and last cards in hand