In low numbers, thats much better than drawing two or three cards like Niv-Mizzet Reborn did
The Mardu colors also give you access to the best removal and protection spells to keep your momentum going
Stitch may be adorable, but dont let the fluff fool you
In Vintage, you can even grab a Mox or Black Lotus
Rhythm of the Wild lets your uncounterable commander attack immediately, which is huge for commanders like Gishath, Sun's Avatar or Voja, Jaws of the Conclave
Golgari has a lot of self-mill effects that will trigger this card drawing ability from your deck, and between Crucible of Worlds, Ramunap Excavator, or Regrowth effects, you can easily treat your graveyard as an extension of your hand when needed