Descarta el comodín.

Yes. In Descarta el comodín, descarta is the affirmative tú command of descartar.

• descartar = to discard, rule out, throw away, reject
• descarta = discard! / throw away!

So the sentence is speaking directly to you in an informal singular way.

Because descartar is the infinitive form, meaning to discard.
In the sentence, you are giving an instruction, so Spanish uses a command form:

• descartar = to discard
• descarta = discard!

This is very common in instructions, games, apps, and manuals.

It is for tú, the informal singular you.

So it would be used when speaking to:

• a friend
• a child
• one player in a game
• the user in an app or game, if the tone is informal

If you wanted the usted command, it would be:

• Descarte el comodín.

By itself, descarta can also be the present tense form meaning:

• he discards
• she discards
• you discard (formal? No, that would be usted descarta as part of a full sentence, not a command)

But in Descarta el comodín., especially standing alone, it is most naturally understood as a command because:

• it starts with the verb
• it sounds like an instruction
• this style is very common in game or task directions

Context usually makes it clear.

El comodín usually means the wildcard or the joker, depending on context.

Common uses:

• in card games: joker
• in games more generally: wildcard
• figuratively: something or someone that can be used flexibly, like a wild card

So in a game instruction, el comodín is probably a special card, tile, or symbol that can stand in for something else.

Spanish often uses the definite article el when talking about a specific object:

• el comodín = the wildcard / the joker

This suggests a particular one that is already known from the context of the game or activity.

Without the article, it would sound less natural in this sentence.

The accent mark shows where the stress goes: co-mo-DÍN.

Without the accent, Spanish spelling rules would make you stress it differently.
So the written accent tells you the final syllable is stressed.

Pronunciation:

• comodín → ko-mo-DEEN

A simple pronunciation guide would be:

des-CAR-ta el ko-mo-DEEN

More approximately for an English speaker:

• descarta = dess-KAR-tah
• el = ehl
• comodín = koh-moh-DEEN

In natural speech, el is short and light.

Yes, but the meaning changes slightly.

• Descarta el comodín. = Discard the wildcard/joker.
• Descártalo. = Discard it.

In descártalo, the direct object pronoun lo replaces el comodín.

Notice the written accent:

• descarta → descártalo

The accent is added to keep the stress in the right place when pronouns are attached.

No. Descartar is broader than that.

It can mean:

• to discard physically
• to rule out
• to reject
• to eliminate as an option

Examples:

• Descarta esa carta. = Discard that card.
• Los médicos descartaron una infección. = The doctors ruled out an infection.
• Descarté esa posibilidad. = I ruled out that possibility.

In Descarta el comodín, it most likely means physically removing or playing away the wildcard in a game context.

Yes, especially in:

• games
• instructions
• apps
• puzzles
• rulebooks

It sounds concise and natural for an instruction.

Depending on the exact game, other verbs might also appear, such as:

• tira el comodín = throw away the joker/wildcard
• juega el comodín = play the wildcard
• elimina el comodín = remove the wildcard

But Descarta el comodín is perfectly natural if the action is specifically discarding it.

For regular -ar verbs, the affirmative tú command usually matches the él/ella/usted present form.

So:

• descartar
• present: él descarta
• command: ¡Descarta!

More examples:

• hablar → Habla
• tomar → Toma
• usar → Usa

So Descarta el comodín follows a very common pattern.