Stealing permanents is something Dimir does better than any other color pair
Despite all ostensibly being graveyard-matters mechanics, things like escape, flashback, and collecting evidence will eat into your delirium count and could take it offline when you need it most
Additionally, if you're looking to be beautifully degenerate, you could clone Omnath as many times as possible for maximum value
Criteria: Instants and sorceries within the Izzet color identity that can deal damage to an opponent without them specifically choosing for that to happen (get outta here, Wheel of MisfortuneWheel of Misfortune and BrowbeatBrowbeat!), and without having an additional cost of sacrificing a creature
The reason I wanted to make a note of it is because its appearing quite frequently in the set in green and goes fantastic with the new Lander tokens which allow you to sacrifice them to go searching for a basic land and put it onto the battlefield tapped
The Mothman also is mechanically very sound as a Commander