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Reanimation spells usually reward you for cheating the mana cost of something enormous; this one prices in the payoff instead. Six mana at instant speed is a lot to ask for a single body out of the yard, but the fight clause is doing the accounting. The creature comes back and immediately swings its power at something you don't control, so the spell folds reanimation and removal into one card and settles both on the same turn. That structure changes what you want to reanimate: not the biggest thing you can find, but the biggest thing that survives the fight and kills whatever it hits, which usually means a creature with power to spare and toughness to soak the return blow. Green's fight package has always been the color's answer to removal it doesn't otherwise get, and stapling it to a graveyard-return effect lets black supply the target while green supplies the kill. The instant-speed timing is the underappreciated part: you can hold it as a two-for-one during combat, let an attacker commit, then return a fatty and eat something in response, all at a window most fight effects (which lean sorcery-speed) never reach. The cost keeps it honest, but the shape is unusually complete for a single card.