Im sure this will be yet another weird Commander buildaround, but I think Niv-Mizzet, Guildpact mostly wants to hang out in the graveyard waiting to get pulled along by your Lazav, Wearer of Faces, like Weekend at Bernies 2: Guildpact Edition
Graveyard hate tends to come at a cost in Modern, with the exception of Scavenging Ooze
Water / 120 / Stage 1
Then, place the rest at the bottom
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Obviously the ability to cast a card that costs three or less for free is a major plus, but if Yahennis Expertise ends up being an unreliable or too-slow sweeper, then it wont be played enough to warrant this slot