Her Phyrexian horrors get bigger and bigger the longer she goes unchecked, and you often have to expend so many resources getting rid of her that it costs you the game
Meanwhile, Gyrus, Waker of Corpses is the least exciting legend from the entire set
Knowing how to recognize a genuine 1st Edition stamp, understanding the specifics of French cards (notably the absence of the Shadowless distinction), avoiding counterfeiter traps, and understanding the relationship between edition and grade: these are the skills that separate the savvy buyer from the vulnerable novice
Play him in spellslinger decks, or just break symmetry with cards like Jeska's Will, Deflecting Swat, and bonus spike points for Dramatic Reversal + Isochron Scepter shenanigans
Support your black enchantments with off-color cards like Sterling Grove and Starfield Mystic