Best method to track deleted records on source in Oracle

We need a way to track deleted records from the source tables in Oracle. We have one source Oracle database and our data warehouse is also in Oracle. I'm somewhat familiar with CDC (asynchronous would do the job) to tap into the logs, but is there anything else in Oracle I could use?
Any ideas of best practices? I only have a few of them. Like 30 records per month. What is the best option?

I heard of a materialized view log being enabled in the source log. The materialized view in the target and do a fast refresh from the mv log in the source (replication using snapshot). It sounds like the same thing as CDC, but anybody heard of this?

You can use Oracle Streams to track delete in source oracle table.