Even with that restriction, I think shes still very playable
No matter what you choose, your colorless creature will not be exiled, and your creature that's both blue and green will be exiled
There, they will be raising money for the Childrens Miracle Network Hospital
Izzet Affinity (6.1% of the Winner's Metagame) 4 Fiery Islet 4 Spirebluff Canal 4 Urza's Saga 4 Kappa Cannoneer 4 Pinnacle Emissary 4 Engineered Explosives 4 Mishra's Bauble 4 Mox Opal 4 Weapons Manufacturing 3 Sink into Stupor 3 Tormod's Crypt 3 Metallic Rebuke 3 Claws of Gix 2 Emry, Lurker of the Loch 2 Arcbound Ravager 1 Island 1 Shadowspear 1 Steam Vents 1 Pithing Needle 1 Welding Jar 1 Aether Spellbomb 1 Skateboard 1 Shivan Reef 3 Damping Sphere 2 Whipflare 2 Galvanic Blast 2 Mystical Dispute 2 Consign to Memory 1 Grafdigger's Cage 1 Force of Negation 1 Vexing Bauble 1 Emry, Lurker of the Loch As the name implies, Izzet Affinity thrives on artifact synergies, quickly enabling metalcraft for explosive starts
Most interestingly, the activated ability on Hauntwoods Shrieker allows you to flip face-down cards up for free, even your opponents' if you want to maybe because its a bad card, or to make them lose the flip-up trigger timing