Then that player mills X cards. You get to not only mill someone out, but also take their coolest stuff
If you can find the right opening the card can easily be a finisher, but I expect it to be a one or two-of in Golgari lists unless things slow down a lot
Edgar, King of Figaro Rarity: Rare TYPE: Legendary Creature SUBTYPE: Human Artificer Noble CMC: 6 Mana cost: USD: $0.26 EUR: 0.18 TIX: 0.02 EDHREC RANK: 9817 (4/5) When Edgar enters, draw a card for each artifact you control
Or like a blue version of Llanowar Elves
As a commander, Gonti can take advantage of creatures like Tinybones, all versions of which steal cards from opponents and will easily frustrate an opponent to no end
Make sure youve got Twilight Prophet, Creeping Bloodsucker, or Exquisite Blood out to offset the damage youre taking