Infantry have 1 or 2 digits.
Most other units 2 to 3 digits.
I don't see 4 happening at all.
The deck is not going to be shuffled.
And it will be 1 to 3 cards that will go back in the deck damaged.
It is very possible that a player ends up with 12 damaged units.
I imagine that players will be looking into their decks from time to time for planning.
Kristopher suggested see through cards with something printed on them.
Personally, this is a good solution, but expensive.
I can see how 10 see through cards have the numbers 1 to 0. And how up to 3 can be used to track health. The numbers could cover the health number on the main card itself.
But I wonder if there are other ways.
Just remember, the cards go back into a deck. And keep track of the damage. No shuffling.
I just reminded myself (in a drunk haze). If i keep my health in a binary form somehow. I could have 4 or 6 dots on the side of a see through card.
And up side down, this card is anotyer value.
So, with 6 dots, there are only 3 variants needed of a see through card.
A is 1 and 32.
B is 2 and 16.
C is 4 and 8.
Well, maybe I go for more dots. And I can flip a card in 2 directions.
But while needing a decent ammount. They can be at least manufactured in a simple way.
The only down side is. For every doubling of a health, you need 1 more card
1024 health would need 10 cards....
Obviously, I need less cards.
I need to think about what is more efficient.
***
Perhaps a ring of some sort. In a very flat form...??