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I suggest the "Pickpocket's Hand" artifact (for Heroes 5)—worn in the hand, it allows you to "steal" one artifact during a battle with an enemy hero; that is, for the duration of the fight, an opponent's artifact is randomly "removed," and the hero owning the hand receives the positive effect of the removed artifact...
Name: Sphere of Storm Winds
Version: Heroes 5
Effect: Active and passive. The sphere's active ability must be triggered in battle (similar to Banshee's Scream)—it increases the positive effect of the Haste spell, reduces the negative effect of the Slow spell, and additionally, all of the hero's flying units receive +1 Movement and +5% Initiative. The passive effect consists of increasing sea movement by 30% (tailwind) and removing the penalty for entering a whirlpool.