Are the magnets on the Magic Keyboard strong enough to hold my ipad with a clear case

Hi there FridaEdith1,

While there's not a way to know for sure without physically trying one(perhaps at an Apple Store, Apple Authorized Reseller, or test a friend's keyboard), for the one compatible with your model, the photos in the link do show no cases on the iPad itself: Magic Keyboard for iPad Pro 12.9-inch

This link will show the nearest service locations, contact details, and available appointment slots under the ‘Service & Support’ section: Find Locations

Cheers!