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Exiling creatures and getting to discover, hopefully getting creatures onto the battlefield (to, say, trigger Intruder AlarmIntruder Alarm), could create a loop of value
All the same, when you want to go for a Cats deck (no dogs, Rin and Seri, Inseparable!), Arahbo is the go-to
A black version would either be more midrange with better odds of hitting land drops all the way to five perhaps even with some ramp, or it would cut much of the white top end
PSA isnt the only major grading company, but they all do the same core job: assessing your cards condition on a 1-10 scale and giving it an official grade