Note: This is a re-post from the old forum.
As an option for a third neutral hero, I present Valerie, Manic Painter:
Valerie – Neutral Creativity Hero
Level 1-3: 1/3; Valerie counts as being all colors
Level 4-6: 2/4; Valerie counts as being all specs
Level 7: 3/5; Your Tech II and Tech III buildings can produce cards of any spec
Creative Thoughts (2 cost)
Pick any two different:
• Deal 1 damage to a patroller
• Put a 0/1 Green Wisp token into play
• Draw a Card
• A friendly unit gains +1 ATK / +1 Armor this turn
Improvisation (2 cost)
Return Improvisation to your Codex, then select a card from your Codex and put it into your hand.
Burst of Speed (1 cost) [edit: down to 1 cost so she isn’t all 2 cost spells]
Your Creativity Hero gains Haste and Swift Strike this turn
Masterpiece (1 Cost) – ULTIMATE [edit: added a cost, because Free is so much less than 1 when you’re talking about Crashbarrow/Blooming Ancient/Grounded Guide]
Put an Upgrade or a Tech II Unit into play from your Codex. Return it to your Codex at the end of the turn, or if it would leave play.
Manic Poet (3 cost, 2/3) [edit: reduced to 2/3 to be closer to Iron Man in power level]
Arrives: Put a +1/+1 rune on another friendly unit
Morose Recluse (2 cost, 2/1) [edit: reduced from 2hp just to reduce Valerie’s overall power level]
Arrives: Put a -1/-1 rune on a unit
Studio (2 cost Building – 4 hp)
Discard a card from your hand -> Gain 2 gold
Draw 2 cards, then trash a card from your hand.
Modeling Clay (4 cost, /)
When you play Modeling Clay it becomes a copy of a unit already in play.
Double Vision (5 cost upgrade)
Arrives: choose 2 different abilities: Overpower, Frenzy: 1, Sparkshot, Resist: 1, Anti-air, Readiness, or Healing: 1. All your units gain the chosen abilities.
Upkeep: you may change your choice.
Mischievous Imp (1 cost, 3/3, Demon)
Arrives: Deal 2 damage to your Base.
Disciple of All (Legendary, 4 cost 5/5)
Disciple of All is considered to be all colors, all specs, and all unit sub-types (eg Illusion, Ninja, etc.), even while not in play. Disciple of All does not die when by spells and abilities.
DiChroma, Rainbow Angel (7 cost 7/7, Legendary Angel)
Haste, Flying, Swift Strike, Overpower, Frenzy 2, Resist 2, Cannot be destroyed except by combat damage.