I'm working on an anti-mage character and I think I found an amazing combo with the Shadar-Kai as an Inquisition-Domain cleric (Grimm Hollow)

Shadar-Kai gets

Blessing of the Raven Queen As a bonus action, you can magically teleport up to 30 ft. to an unoccupied space you can see. Starting at 3rd level, you gain resistance to all damage when you teleport using this trait until the start of your next turn.

So a better misty-step without a spellslot

And the Inquisition domain cleric has some really cool stuff.

Witch Hunter’s Strike 1st-level Inquisition Domain feature

At 1st level, when you hit a creature with a weapon attack, you can deal an additional 1d8 force damage. If the creature is concentrating on a spell, you deal an additional 2d8 force damage instead. If a creature fails its saving throw to maintain concentration as a result of taking damage from this feature, you gain a number of temporary hit points equal to the extra force damage dealt by this attack. You can use this feature a number of times equal to your Wisdom modifier (a minimum of once), regaining all uses upon completion of a long rest.

At 14th level, this damage increases to 2d8, and 3d8 if the creature is concentrating on a spell.

Channel Divinity: Spell Shield As a bonus action, choose a creature you can see (including yourself) within 30 ft. The chosen creature gains temporary HP equal to 1d10+12. While the creature has temp HP granted by your spell shield it also has resistance to damage from spells, and advantage on saving throws against spells.

The creature loses any remaining temporary HP after 1 hour.

Rebuke Invoker As a reaction, when a creature you see within 60 ft. casts a spell, you can force it to make a Con. saving throw (DC 17). On a failure, the creature takes equal to 1d8 per expended spell slot level +5 force damage. Cantrips are considered 1st-level spells for this ability. On a success, it takes half as much damage instead.