Estamos embaralhando o baralho agora.

This is the Portuguese present progressive, used to show an action happening right now.

• estamos = we are
• embaralhando = shuffling

So estamos embaralhando literally matches English we are shuffling.

The structure is:

estar + gerund

Examples:

• Estou lendo. = I am reading.
• Estamos comendo. = We are eating.
• Ela está falando. = She is speaking.

In Brazilian Portuguese, this is the most common way to express an action in progress.

The base form is embaralhar, which means to shuffle.

embaralhando is the gerund form, similar to English -ing.

For regular -ar verbs, the gerund is formed like this:

• embaralhar → embaralhando
• falar → falando
• trabalhar → trabalhando

So:

• estamos embaralhando = we are shuffling

Baralho usually means a deck of cards.

So o baralho means the deck or the deck of cards.

In this sentence, embaralhar o baralho is the natural way to say shuffle the deck.

Related words:

• carta = card
• cartas = cards
• baralho = deck of cards

So:

• embaralhar o baralho = shuffle the deck
• embaralhar as cartas = shuffle the cards

Both can be understood, but embaralhar o baralho sounds very natural.

Portuguese uses definite articles more often than English does.

So where English might say:

• shuffle the deck

Portuguese naturally says:

• embaralhar o baralho

Leaving out o would sound incomplete in most normal contexts.

This is very common in Portuguese:

• fechar a porta = close the door
• lavar as mãos = wash the hands / wash your hands
• abrir o livro = open the book

No, agora is not strictly necessary, because estamos embaralhando already suggests an action happening now.

So both are possible:

• Estamos embaralhando o baralho.
• Estamos embaralhando o baralho agora.

Adding agora gives extra emphasis to right now / at this moment.

Yes. Portuguese allows some flexibility with agora.

These are all possible:

• Estamos embaralhando o baralho agora.
• Agora estamos embaralhando o baralho.
• Estamos agora embaralhando o baralho.

The first one is probably the most neutral and natural in everyday speech.

The second one puts a bit more focus on now.

The third is grammatical, but it can sound a little more formal or marked.

Portuguese often drops subject pronouns when the verb already makes the subject clear.

• Estamos already tells you the subject is we
• So nós is optional

You can say:

• Estamos embaralhando o baralho agora.
• Nós estamos embaralhando o baralho agora.

Both are correct.

Adding nós may give:

• emphasis
• contrast
• clarity

For example:

• Nós estamos embaralhando o baralho, não eles.
  = We are shuffling the deck, not them.

These two spellings are very important in Portuguese.

• lh sounds like the lli in million for many English speakers, though not exactly the same.
• nh sounds like the ny in canyon.

So:

• baralho sounds roughly like ba-RA-lyo
• embaralhando contains both:
  • lh = ly
  • nh = ny

A rough English-friendly approximation:

• embaralhando ≈ em-ba-ra-LYAN-doo
• baralho ≈ ba-RA-lyoo

These are only approximations, but they help.

Mostly, embaralhar strongly suggests shuffling cards or putting things into a mixed order.

It can also be used more broadly in some contexts, but for cards it is especially natural.

For example:

• embaralhar as cartas = shuffle the cards
• embaralhar o baralho = shuffle the deck

There is also a more general verb:

• misturar = to mix

So:

• misturar is broader
• embaralhar is more specific for shuffling

People would probably understand you, but embaralhando is the better choice for shuffling cards.

• misturar = mix
• embaralhar = shuffle

So for a deck of cards, embaralhar sounds more precise and natural.

A good comparison:

• misturar ingredientes = mix ingredients
• embaralhar cartas = shuffle cards

Yes. In everyday Brazilian Portuguese, a very common casual version would be:

• A gente tá embaralhando o baralho agora.

Here:

• a gente literally means the people, but very often means we
• tá is the informal spoken form of está

So this is a very natural spoken alternative.

Compare:

• Estamos embaralhando o baralho agora. = standard
• A gente tá embaralhando o baralho agora. = casual spoken Brazilian Portuguese

Not with the same meaning.

Embaralhamos is usually understood as:

• we shuffled or sometimes
• we shuffle

It does not naturally mean we are shuffling right now in the way English does.

If you want to clearly express an action in progress, Brazilian Portuguese normally uses:

• Estamos embaralhando o baralho agora.

So for right now, the sentence you were given is the best choice.

The direct object is o baralho.

That is the thing receiving the action of the verb.

So in:

• Estamos embaralhando o baralho agora.

we have:

• Estamos embaralhando = verb phrase
• o baralho = direct object
• agora = time expression

In English:

• We are shuffling = verb phrase
• the deck = direct object
• now = time expression

Yes, it works perfectly in Brazilian Portuguese, and it is also grammatical in European Portuguese.

However, Brazilian Portuguese strongly prefers this structure for an action in progress:

• estar + gerund
• estamos embaralhando

In European Portuguese, you will often hear:

• estamos a embaralhar o baralho agora

So if you are learning Brazilian Portuguese, Estamos embaralhando o baralho agora is exactly the kind of form you should learn and use.