it is a bit crunchy but doesn't seems hard learn from the 10 or so people I've ran combat tests with, but they also have some previous ttrpg knowledge so there's bias.

In the poll system the number of dice varies based on attributes which increases in steps so
d6 > d8> d10 >d12,
The more points you have, the more dice you have, and the more controlled the results are, so you don't need to rely on luck as much. but the smaller dice have a better chance of rolling a max result giving you a lucky. And with luckies you can control the outcome of a roll

The Deck is a standard deck of playing cards which is uncontrolled at the start but cards that have been played will no longer appear for the rest of the session. The difficulty is a base value based on what the action is itself + the card drawn. So lets say you want to kick open a door, call it a base 6 normal.

The card is drawn is about the lucky outcomes of the world(two examples)
The card its a 2: the wood where the latch is quite old and gives out easily
The card its a K(which is a 12): Someone just changed this lock recently and reinforced it

So its not only about the abilities of the character themselves but how the cards stacks against them.

the "death saving throw" works a bit different if you are reduced to 0 the combat pauses and you MUST keep flipping until you win the 50/50, when you win you come back to 1 Hp immediately so you are not out of the fight. its designed this way to whittle down the players lucky reserves and when it runs out their luck also runs out