Izzet Prowess is a fast aggressive mirror of the graveyard/spells plan, so Lightning Axe is excellent removal for Monastery Swiftspear or Dragon's Rage Channeler before they get out of hand, and the discard cost is trivial in a deck full of extra cards to pitch. Boseiju, Who Endures comes in as a land that can later Channel to blow up a problematic artifact like Cori-Steel Cutter or a nonbasic land, replacing lesser lands is not needed so we swap it for two Golgari Thug copies since their low-toughness aggressive plan punishes our slow dredge engine. Vexing Bauble is tempting since free spells like Mutagenic Growth (paid with 2 life) give it real targets and it could be considered, but we prioritize removal instead since racing matters more than countering pump spells. Artist's Talent is cut because we're not looking to grind incremental card filtering in a race we need to win on damage and removal.