のが夢だ

it's a dream to

→ の
phrase Rare #25,128
it's a dream to Follows a verb in its plain form; の turns the action into a noun-like phrase that is described as a dream.
JA: トムは大金持ちになるのが夢だ。
EN: Tom's dream is to become very rich.

彼とここで会うのが夢だ。

It's my dream to meet him here.

トムは大金持ちになるのが夢だ。

Tom dreams of becoming very rich.

飛ぶのが夢だ。

I dream of flying.

狩りができる広い土地付きの家に住むのが夢だ

My dream is to live in a house with a large tract of land where I can hunt.

— レベッカ (1940)