Learn Polish: Nie wiem, czy talia ma dwójkę i trójkę. - I do not know whether the deck has a two and a three.

Here, we are talking about the names of specific playing cards (a two and a three), rather than counting a quantity of objects. When a number acts as a noun, Polish uses feminine reified numerals ending in -ka (like dwójka and trójka). You will also see these used for bus routes, school grades, or sports jersey numbers.

Why do dwójka and trójka end with -ę in this sentence?

Because they are the direct objects of the verb ma (has), so they must take the accusative case. Even though they are derived from numbers, these reified numerals act exactly like standard feminine nouns. They follow the normal rule: the nominative -a changes to -ę in the accusative.

Could I use jeśli instead of czy to mean if here?

No, you must use czy. While English uses if for both situations, Polish distinguishes them. Use czy when expressing doubt or introducing an indirect question (meaning whether). Use jeśli only for conditional statements, like If I have a deck, I will play.

Does the word talia mean anything else besides a deck of cards?

Yes! Talia is a common homonym in Polish. Besides meaning a deck or pack of cards, it is also the word for a person's waist.