Is it possible to render an Adsense Block as a custom field block in Drupal? I'm trying to add an adsense banner inside my content and Drupal's Adsense regular module doesn't do that. It can only add Adsense in one of my regions but none within articles. Would that be possible using Display Suite?
You can use Block Inject to create an arbitrary region in your node body. Then place the adsense block in that region. (Please be aware of this issue.)

On a page by page basis, you can also use Insert Block, but there are limitations.