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The cantrip-of-death bird, Baleful Strix, is an amazing 2-drop for Dimir decks

Force of Negation Part of the Force cycle from Modern Horizons , Force of Negation is a powerful free counterspell

Too many players think that only Spellslinger or Storm decks will want to run this, but as long as you have a reasonable number of instants and sorceries, Mizzixs Mastery will give you a rush of value to help you pull ahead

you could also use things like Silent-Blade Oni, Ink-Eyes, Servant of Oni, and Fallen Shinobi for extra stealing fun, but given that they're Ninjas, they don't work as well without a dedicated Ninja strategy