Understand I am a Christian.

"Peter asks whether Tarot Cards can serve as a channel to communicate with the supernatural."

Yes it can. Understand What we do in the physical world can affect out interaction with the supranational.

Paul to the Church at Ephesus.

"For our struggle is not against flesh and blood, but against the rulers, against the authorities, against the powers of this dark world and against the spiritual forces of evil in the heavenly realms."

There are Beings in the supernatural world that DO NOT have you best interests at heart.