The biggest problem is how to substitute Boros Swiftblade and Lightning Helix. I think that idea with Master Warcraft and Incite Hysteria, about making creatures (almost...) free to deal damage, could work in mono W as protection from the color of opponents creatures. There are also spells like Fortify and Kjeldoran War Cry, it's not the same as Taste For Mayhem, but strengthens all creatures.
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