Although healing is a miracle, and faith can lead to all kinds of miracles, this singling out of “mighty miracles” emphasizes the variety of spiritual gifts.
Reference: This verse replicates the subject of miracles from 1 Corinthians 12:10 but alters the phrasing. In other words, it draws upon but does not copy the model. It has been reworked into the text of Moroni’s declaration.