Lanço o dado agora, vai que ganho pontos.

In Portuguese, the present tense is often used for something you are about to do right now. So Lanço o dado agora sounds natural for an immediate decision.

It is similar to English using the present in certain contexts:

• I go now
• I’m rolling now
• I’ll do it now

A more explicit future-like version would be:

• Vou lançar o dado agora.

But Lanço o dado agora feels quick, immediate, and spontaneous, which fits the sentence well.

Portuguese often omits subject pronouns when the verb ending already makes the subject clear.

Here:

• lanço = I throw / I roll
• ganho = I win / I gain

Because the -o ending clearly shows eu, saying eu is optional:

• Lanço o dado agora...
• Eu lanço o dado agora...

Both are correct, but leaving out eu is very common and natural.

Here, dado means die (the singular of dice).

So:

• o dado = the die
• os dados = the dice

This is a very common point of confusion for English speakers, because English uses die/dice, while Portuguese uses:

• singular: dado
• plural: dados

In other contexts, dado can also mean:

• given (as a past participle of dar in some uses)
• data in certain formal expressions

But in this sentence, because of lanço o dado, it clearly means the game object.

Portuguese usually uses articles more often than English.

So when referring to a specific thing in the situation, Portuguese naturally says:

• lançar o dado = roll the die

Even when English might say just roll dice or roll the die, Portuguese often prefers the article:

• o dado
• os dados

Without the article, Lanço dado agora would sound unnatural here.

Vai que is a very common colloquial expression in Brazilian Portuguese. It does not usually mean literally go that.

In this kind of sentence, it means something like:

• what if
• maybe
• who knows
• just in case
• there’s a chance that

So vai que ganho pontos expresses an uncertain but hopeful possibility:

• maybe I’ll get points
• what if I get points?

It is often used when someone does something on the chance that something good might happen.

After vai que, Brazilian Portuguese often uses the present indicative, especially in everyday speech.

So:

• vai que ganho pontos = natural, colloquial

Literally, that structure looks like:

• what if I win points
• maybe I win points

For an English speaker, it may feel surprising because English often uses I might win or I’ll win instead.

You may also hear:

• vai que eu ganho pontos

That is the same idea, just with the pronoun included.

Using ganhar would not fit the structure here, and ganhe would sound more like a different grammatical pattern, not the usual everyday vai que expression.

It is mostly informal and very common in spoken Brazilian Portuguese.

It sounds natural in conversation, messages, and casual writing. But in more formal language, people would usually choose another structure, such as:

• Talvez eu ganhe pontos.
• Quem sabe eu ganhe pontos.
• Pode ser que eu ganhe pontos.

So vai que is very useful to understand and use in everyday Brazilian Portuguese, but it is not especially formal.

The comma separates two parts:

1. Lanço o dado agora
2. vai que ganho pontos

The second part adds the motivation or hopeful possibility behind the first. In writing, the comma helps show the pause and the change in tone.

It feels a bit like:

• I’ll roll the die now, maybe I’ll get points.

In casual writing, punctuation may vary, but the comma is very natural here.

Yes. That is completely natural.

Compared with the original:

• Lanço o dado agora, vai que ganho pontos.

your version:

• Vou lançar o dado agora, vai que eu ganho pontos.

sounds slightly more explicit because:

• vou lançar makes the future intention clearer
• eu ganho keeps the subject visible

The original sounds a bit more quick and conversational; your version sounds a little fuller, but both are good Brazilian Portuguese.

Pontos is plural because the speaker is talking about getting some points, not necessarily one point.

Portuguese often leaves out the article in cases like this when speaking generally:

• ganhar pontos
• perder tempo
• comprar comida

So:

• ganho pontos = I get points / I score points

If you added an article, the meaning would become more specific:

• ganho os pontos = I get the points (specific points already known)
• ganho uns pontos = I get some points

In the original sentence, plain pontos is the most natural choice.

Yes, it is natural. Lançar o dado literally means throw the die, and that is a normal way to express the action in Portuguese.

Depending on context, people might also say:

• jogar o dado
• rolar o dado (less literal, influenced by game language)

But lançar o dado is perfectly correct and natural, especially in game-related contexts.

Yes. It sounds natural, conversational, and idiomatic.

What makes it especially natural is:

• omission of eu
• use of the present tense for an immediate action
• use of the colloquial expression vai que
• simple noun phrase ganho pontos

So this is a good example of everyday Brazilian Portuguese rather than textbook-style language.