Is this investment a good idea?
The cards do not predict markets, and any reading that claims to is selling you something. What a reading can do is show you what you are not looking at in your own decision.
Usually that is one of two things: a risk you have decided to call acceptable, or information someone has not given you.
We'll read this as: What am I not seeing about this decision?
Cards that often come up
Seven of Pentacles
Pulling it up to check is how it fails.
Seven of Swords
Something is being left out of the conversation.
Five of Pentacles
The cold version of this, and how long it would last.