It brings the best creature out of someones graveyard and then gets rid of the rest
Inquisitor Greyfax is a fairly cheap Human commander who gives your whole board Vigilance, while cheaply tapping down enemy creatures and creating Clue tokens
On top of that, the ability to scale its damage with additional mana makes it a flexible tool in the mid-to-late game
At best youll deprive them of a few key resources, at worst (and more often than not), youll make their deck more consistent by trimming the fat
If you discard a card while you control Hades, Sorcerer of Eld, abilities that function when a card is discarded (such as madness) still work, even though that card never reaches your graveyard
Ive been playing Magic in some capacity since I was 10 years old