Let me gather the necessary data simultaneously — I'll look up the archetype overview and search for the card at the same time.
The card "Pompous Battlemage" wasn't found in the database or on Scryfall. Also, the archetype overview returned a Standard result — let me look specifically for the Modern format Izzet Prowess archetype.
The Modern prowess archetype is simply called "Prowess" (not "Izzet Prowess"), and "Pompous Battlemage" doesn't exist in our database or on Scryfall. Let me search for it under possible alternative names, and also pull the Prowess archetype winrate data.
I was able to find the Modern Prowess archetype, but "Pompous Battlemage" does not exist in our database or on Scryfall — it doesn't appear to be a real Magic: The Gathering card.
Here's what I can share:
⚡ Modern Prowess — Last 60 Days
⚠️ Note: In the Modern database, this deck is tracked simply as "Prowess" (not "Izzet Prowess"). It's the same archetype.
As for Pompous Battlemage — this card doesn't appear to exist in any MTG set I can locate (not in our tournament database, nor on Scryfall). Could you double-check the card name? It's possible you may be thinking of a different card. If you can clarify, I'd be happy to run the with/without split on winrates!