Maybe its weak to the opponents type or just isnt hitting hard enough
Really cheap sweepers like Path of Mettle, Golden Demise, and Goblin Chainwhirler are still effective, but your opponent needs to have exactly the right answers
End the FestivitiesEnd the Festivities (46,795 Inclusions, 2% of 2,337,008 Decks) This won't be the last "pay one mana to draw three cards" spell we see on this list, but it might actually be the best of them with Niv-Mizzet
There are multiple ways to just get it back, from Venser, the Sojourner or Animatou, the Fateshifters -1 ability in your Esper version (which will of course bring it back untapped and ready to go) to Brooding Saurian in your Golgari, Sultai, Jund, or Abzan deck