Przeciwnik nie dość, że oszukuje, to jeszcze odrzuca twoją kartę.

It’s a fixed Polish pattern meaning something like:

• not only ... but also ...
• as if it weren’t enough that ..., ... as well
• on top of that ...

It often sounds a bit emotional, especially when the speaker is annoyed or complaining.

So in this sentence, the structure suggests:

• the opponent is already doing one bad thing: oszukuje,
• and then adds another bad thing: odrzuca twoją kartę.

Compared with nie tylko ..., ale też ..., this structure often feels more expressive or accusatory.

Because nie dość, że ... is a set expression.

Here że introduces a full clause:

• że oszukuje = that he is cheating

So you should learn nie dość, że ... as one chunk, not as separate words you translate one by one.

A very useful way to remember it is:

• Nie dość, że X, to jeszcze Y.

That whole frame works together.

In this sentence, to jeszcze completes the correlative structure started by nie dość, że ....

So:

• nie dość, że oszukuje
• to jeszcze odrzuca twoją kartę

Together they mean: not only is he cheating, but he’s also discarding your card.

A few notes:

• to here is not the ordinary this/it.
• It works more like a linking word in this pattern.
• jeszcze does not mean still here. It means something more like in addition, what’s more, or even.

It’s the same word, but a different use.

Jeszcze can mean:

• still
  
  • Jeszcze czekam. = I’m still waiting.
• yet
  
  • Jeszcze nie wiem. = I don’t know yet.
• more / in addition / on top of that
  
  • which is the meaning here

In to jeszcze odrzuca twoją kartę, it means something like:

• what’s more
• on top of that
• even

So here it adds emphasis, not time.

The commas are connected with the structure nie dość, że ... , to jeszcze ....

The clause introduced by że is separated by a comma from the next part:

• Przeciwnik nie dość, że oszukuje, to jeszcze odrzuca twoją kartę.

This is the normal punctuation for this construction.

You can think of it as dividing the sentence into two linked parts:

1. nie dość, że oszukuje
2. to jeszcze odrzuca twoją kartę

Because Polish often uses the present tense for:

• actions happening now
• repeated actions
• general behavior
• game descriptions or commentary

So this sentence can mean something like:

• the opponent is cheating and discarding your card now,
• or that this is what the opponent does in the game.

Also, both verbs are imperfective:

• oszukiwać / oszukuje
• odrzucać / odrzuca

That is important, because in Polish the present tense of a perfective verb usually refers to the future.

So if you want real present-time meaning, you normally use the imperfective form.

Because odrzucać takes a direct object, and the direct object here is in the accusative case.

The base form is:

• twoja karta = your card
  nominative

But after odrzuca (discards/rejects), it changes to accusative:

• twoją kartę

So:

• twoja karta = your card as the subject
• odrzuca twoją kartę = he discards your card as the object

Because karta is a feminine noun ending in -a, and in the singular accusative it usually changes to -ę.

So:

• nominative: karta
• accusative: kartę

This is a very common pattern for feminine nouns:

• mam kartę
• widzę kobietę
• czytam książkę

So kartę is exactly what you would expect after a transitive verb like odrzucać.

Because adjectives and possessive words in Polish have to agree with the noun they describe.

Since kartę is:

• feminine
• singular
• accusative

the possessive word must match it:

• nominative: twoja karta
• accusative: twoją kartę

So the ending changes because of case agreement.

Przeciwnik means opponent, adversary, or sometimes enemy, depending on context.

In a game sentence like this, opponent is the most natural meaning.

Grammatically, here it is:

• masculine
• singular
• nominative
• the subject of the sentence

So Przeciwnik is the one doing the actions:

• oszukuje
• odrzuca

Yes, you often could.

For example:

• Przeciwnik nie tylko oszukuje, ale jeszcze odrzuca twoją kartę.
• Przeciwnik nie tylko oszukuje, ale też odrzuca twoją kartę.

But the original nie dość, że ... to jeszcze ... usually sounds more emotional and more like a complaint.

Very roughly:

• nie tylko ..., ale też ... = more neutral
• nie dość, że ... to jeszcze ... = stronger, more annoyed, as if that weren’t enough...

So the original sentence has a more frustrated tone.

Polish word order is flexible, but this version is the most natural and neutral.

The standard pattern is:

• Nie dość, że X, to jeszcze Y.

So:

• Przeciwnik nie dość, że oszukuje, to jeszcze odrzuca twoją kartę.

You can move things around for emphasis, but not every rearrangement sounds equally natural.

For example, Polish might allow emphasis like:

• Przeciwnik nie dość, że oszukuje, to jeszcze twoją kartę odrzuca.

But that sounds more marked and stylistically special. For a learner, the original order is the best one to copy.

The form oszukuje is the present tense of the imperfective verb oszukiwać.

That matters because Polish verb pairs often work like this:

• oszukiwać = imperfective
• oszukać = perfective

Similarly:

• odrzucać = imperfective
• odrzucić = perfective

In this sentence, the present tense forms are used:

• oszukuje
• odrzuca

That points to imperfective verbs, which are the normal choice for present-time meaning.

If you used the perfective forms in the present, they would usually sound future-oriented instead.