Quantity is not a problem at all, but above all else, a black spell looks great in the Double Feature foiling
Ranking: Fun In The 99 Taigam, Master Opportunist Much like Shiko and Narset, Unified, Taigam rewards you for playing the game
Swarmyard has been in the deck since the mono-black days, but I have to admit I might end up cutting it because it can sometimes get in the way of trying to cast Garth due to only being able to tap for colorless mana
While that's not the most terrible idea, the likelihood in a Niv-Mizzet deck is that the other spell you're casting is a burn spell that could do the same, and I have to feel that you're going to be better off casting it by itself, rather than putting all your eggs in one basket
Outside the battlefieldlike in your graveyard or librarya double-faced card is only recognized by its front face