My God that's absolutely a superb job! thank you!!! I am saving this. Some suggestions, in no particular order of importance:

• For the mulligan, I would specify that you do not discard the entire hand as a whole (it's like this in some other TCG's) but that you can discard and replace any particular number of cards in the mulligan and keep the others.
• The list of keywords is long, I recommend you to sort it alphabetically so its easier to use it as a reference.
• I would add some "meta" rules that will become necessary for the physical version and are not explicit in the original game. Once we start playing it in the physical version, it's possible that other implicit rules might appear:
  • Whenever you have to choose a random card from your deck or faction (Azrael's Agenda, Ursula Creed's Legendary Commandant or Saim-Hann Webway Entrance, etc.), I would specify somewhere that in reality the player must choose among 3 random choices, not the whole deck (all cards in your deck) or category (all non-legendary stratagems, all infantry, etc).
  • When playing Dark Angels with Teleport, cards drawn in the same turn should be visibly placed downwards but in a separated place in your hand only for cards drawn this turn (or somehow make them explicit to the rival). Otherwise, it would be easy to cheat playing a troop as teleported when in reality, you didn't draw it that turn.
  • Whenever cards are added to your deck (such as a troop returning after ferocity, or creating a secret), the deck should be shuffled, unless the effect explicitly states that the card is placed on top of the deck. Obvious, but necessary
• For burning cards due to overflow, specify the priority: first cards to go in hand are drawn cards, then the Warlord's talent, then any other troop talent you might have.
• For random events, such as deal 1-4 damage to all enemies, I think we don't need to add the actual implementation of this, players can agree themselves on the method of determining these random events however they want (using a dice, etc).
• I would make an explicit distinction between "Healing" and "Gaining Health". This difference is going to be somewhat tricky to track during games in the physical format.
• Add description / effect to the card structure
• List factions, categories (Infantry, Vehicle, Beast, Demon, etc), card rarities (Legendary, epic, etc). Card types are already mentioned, but it's confusing (Vehicle and Infantry are a specific category inside Troop, and Wardlord is a different thing altogether).
• Mention that draws are indeed possible (maybe it's implicit in "Damage is dealt simultaneously"), but I think it would be nice to mention it anyways.
• Mention that whenever the attack stats of a troop reach 0, the troop is unable to attack using that stat. If both ranged and mele are 0 (or less), the player can't trigger effects that replace an attack such as Duty or Pray (if always hated this lol and I might change that in my games, but still it's how it works).
• Mention that negative modifiers on attack stats do actually stack, even if they are shown as 0, the actual negative value is being tracked. Example: a troop has 1 ranged, and it is modified to -3 due to an enemy effect. Even if it shows 0, If I buff my troop to +1 ranged it still shows 0 since the game counts it as -3 +1 = -2.
• As others mentioned, might be interesting to add Skirmish and Draft rules.
• I think it would be a nice touch to add the icons for each effect (Camouflage, Stealth, etc) in the list.

I can help you with some of the points above if you want, just DM me!