Concept

Not a very cohesive archetype. Reliquarian works best as a complementary finisher for decks that are playing big minions anyways and in factions with good Relic effects (Magmar, Vetruvian). Can be reasonably built around as the primary finisher in a combo deck for some other factions (Abyssian, Vanar). Total meme for the factions with bad Relic effects (Lyonar, Songhai).

Cards

Reliquarian

Reliquarian’s ability is to “Forge” a minion into an artifact, which means sacrifice a minion and equip a Relic. The Relic artifact gives your general +X attack, where X was the attack of the sacrificed minion, and a bonus effect depending on the same value of X and the faction of the sacrificed minion. See his wiki page for more details.

This means that to make good use of Reliquarian, you need to have big faction minions, ideally buffed. Hence, while the decks can play somewhat similarly across factions, there’s no real common neutral core that appears in every list, besides the namesake card.

Example Decklists

Lyonar – Argeon pumps power for bigger Shining Relics, and if you can suit up the full set of artifacts you are essentially unkillable. Decklist.

Songhai – Very inconsistent, but Bangle + Blazing Relic does output a ton of damage. The Blazing Relic is also one of the only Relics to trigger on counterattack, which makes it tricky to remove cleanly. Decklist.

Vetruvian – Forging a 0-cost Pantheran is amazing value, especially because it will be returned immediately by the Barren Relic. Decklist (credit AlphaCentury)

Abyssian – Good synergy with Arcane Devourer. Unfortunately the Void Relic only triggers on attack (and only against minions!) and not counterattack, so be careful with your general’s positioning. Decklist.

Magmar – Any swarmy deck can run the package of Reliquarian + Mandrake to give you a big Primal Relic as a surprise finisher. Decklists: dedicated, mech swarm (credit Zohan), build (credit Embrace Works)

Vanar – The list above plays off the Vespyr synergies of the Howling Relic, but you could also do a more all-in version. Decklist.