He shuts down larger spells, hurts ramp, storm, buyback, my own Equinaut deck (which likes to play and replay creatures), and countless other decks that either want to cast something big or net multiple spells
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Kazuul's Fury does require you to have creatures in your deck, but that's usually not a problem for red-based decks
I believe that [casthaven]Eldrazi Temple[/casthaven] is too good for Modern (with Battle for Zendikar and Oath of the Gatewatch its become [casthaven]Ancient Tomb[/casthaven] with no downside), as is [casthaven]Eye of Ugin[/casthaven] (which was already a major role-player in Tron)
This lets the strongest deck get further ahead