Krabi comes with a two-column layout and a prominent subscription form in the sidebar to encourage people to subscribe.
Krabi comes with full membership and members support which makes it the ultimate theme for monetizing your blog with Ghost. The pricing/subscribe page is visible to non-logged-in users.
The tags menu makes it easy to browse the blog tags and it is visible on every page.
If the blog tags are more enough for the theme width, a smooth and elegant scroll will be visible to scroll over all the remaining tags.