Blue will bring the ability to draw enough cards to keep going and return annoying permanents to your opponents hands, black brings with it graveyard tutors and the ability to return permanents from your graveyard to the battlefield and green gives us removal pieces to deal with some common graveyard hate effects, plus some of the heaviest hitters in the format that are worth reanimating
Roughly, the graded value of the card would be $1,000-$2,000, which as you can see would be worth the $80 or so to have it graded
This means that it can be dicey to equip this one because there are so many popular commanders that love the graveyard
Gix has already seen reprints in TDC and the Final Fantasy bonus sheet, but despite that, hes still commanding a solid price
Black is also a reanimator color, able to use any big creatures pitched early as an accelerated mid-game threat
The best shapeshifter in the game, it honestly has a place in every list for the best commanders for any creature type because thats exactly what its designed to do