OP: My mage is being stalked by a mage killer who has incredible close combat skills, and technologically enhanced abilities that enable him to detect and disable magic.
Me: You could have a number of mundane traps primed and ready to go, held in place by magic.
Me: For example, you could plaster claymore mines into the walls, trigger them, and stop time around said claymore mines with a temporal stasis spell.
Me: Mage killer enters room, senses magic, goes “AHA, a TRAP! I shall NEUTRALISE it with my ANTI MAGIC FIELD OHHHHH SHHHHHIIIIIII-!”

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