Izzet Affinity is stuffed with artifacts like Giant's Boulder and The One Ring, so Ingot Chewer's ETB destroy-target-artifact ability is excellent removal, while the extra Trumpeting Carnosaur copies give us more discover-5 card advantage to grind through their countermagic-heavy shell (Force of Will, Force of Negation). We trim Tibalt's Trickery since countering into a random cascade-style spell is unpredictable against a deck full of expensive spells that could get cast for free off the top, and we cut two Violent Outburst since its cascade hit rate is lower value than dedicated artifact removal here. Watch for effects like Kozilek's Command exiling our threats from the graveyard, and prioritize Boseiju, Who Endures to blow up Urza's Tower-cycle lands if needed.