Your interpretation of Catholic teaching is irrelevant.
The Church teaches that we can ask the saints in heaven to pray for us. The Bible reveals the saints in heaven presenting our prayers to God.
“And when he had taken it, the four living creatures and the twenty-four elders fell down before the Lamb. Each one had a harp and they were holding golden bowls full of incense, which are the prayers of God’s people.”
The real question is, Where is Luther’s doctrine of Sola Scriptura in the Bible?
Nowhere.
Christ gave us the example of referring to Scripture when He said..."It is written...."
When Satan was tempting Him, Jesus refuted Satan with Scripture. It's also telling that Satan knew Scripture, yet he misquoted or omitted parts to serve his purpose.
That's why we should always look at Scripture in context.
The Church teaches that we can ask the saints in heaven to pray for us.
You need to change churches then.
The real question is, Where is Luther’s doctrine of Sola Scriptura in the Bible?
All throughout it, if you read it. 2 Tim. 3:16,17 "All Scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness: that the man of God may be perfect, thoroughly furnished unto all good works."