You can play him on curve much much more safely than most planeswalkers because his effective cost is just two mana (normally, it can be a lot less if you have things that tap for more than one)
As card #187 in a set with 132 printed cards, it sits in the secret-rare numbering pulled less often than anything in the regular checklist
Appearing only in The Brothers War Collector Boosters, these MTG cards can be found in less than 1% of boosters. Even when rounding that percentage up to 1%, that still makes pulling one of these prized cards exceedingly unlikely
The 'Let Your Power Shine' ability also lets you draw a card whenever you remove one or more damage from one of your characters
Sealed boxes now trade at ~14,000 ($99) on the secondary market, nearly 3x their original MSRP
While Clouds ability seems slightly more generic - all Final Fantasy characters use equipment - this makes sense based on how iconic his weapon is