It pairs nicely with delve cards like Dig Through Time to control what you exile
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You can even Recommission it to be a 4/5 if youre feeling nostalgic about old Rhino
You'll be moving a lot of counters as many creatures benefit from having them as it'll unlock more powerful effects compared to their base ones
While it is not easy to kill it is not out of the question at all to get it dead which is often as much of a scoop for them as it is for you when you can't kill it
It's been errata'd from a 'carriage' (which implies the creature represents the whole unit) to 'Horse', so I guess the flavour of the mechanic is the horses just being lazy until they are 'fed' with a creature