Here are some cards that I highly recommend to you, in order to combo off faster, and better: Fume Spitter (I love him but only in my starting hand) Diabolic Servitude (maybe, but recommend) Infernal Darkness (maybe, but always worth it) Sidisi, Undead Vizier (maybe...) Dread Return (maybe...) Pentavus (The only 7-drop allowed in this deck) Grinding Station (you have many artifact creatures then...) Some nice ways to tutor are:Dimir Machinations and Shred Memory
The card seems incredibly powerful in Muldrotha, the Gravetide, for example
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Best to stick to iconic cards here, with a few props on hand to help, spaghetti for an Emrakul
(2018-10-05) Players can cast spells and activate abilities after Niv-Mizzet's second triggered ability resolves but before the spell that caused it to trigger does
Exerting a rival character can open them up to challenges from your own characters if their player isnt likely to put them at risk by questing or challenging, helping to clear irritating passive effects and other abilities off the field