The convert ability functions just like transform, so much so that if an ability triggers whenever a permanent transforms, itll also trigger when a permanent converts
That still leaves a lot of room to the imagination, but Ill be digging up commanders with unique rules text, ones that ask you to build around a unique subcategory of cards, or ones that require warping an entire deck around them, preferably something youd never build without that exact commander encouraging you to do it
The idea is that each set will have a specific card that will be the card that you want to pull, and a card with chase variants to look for
Lumbering Battlement especially loves Reveillark, which triggers on leaving the battlefield, not just dying
Captain Hook, Forceful Duelist is a Dreamborn card in Steel that offers solid attacking power thank to its Challenger ability, which grants extra strength when challenging