The "Elemental Hammer" build uses the Hammer weapon and all the Relics that apply Burn, Chill and Weak on Charged attack, plus all the other Relics that boost your damage. Full of Relics below:
Two Uneven Matches - used to apply Burn on Hammer Charged Attack
Two-Town Diary - user to apply Weak on Hammer Charged Attack
Long John's Wick - increased Burn duration by 5 seconds
Unspoiled Bandage - increased damage by 30% while above 50% Health
Immaculate Prism - increases change to Multicast by 15%
A Unique Snowflake - increases damage to Chilled foes by 33%
Toad Witch Idol - increases maximum Poison Stacks by 3
Frosty Syringe - used to apply Chill on Hammer Charged Attack
Nail Of Joar - 40% damage increase against Shielded foes
Notched Belt - stackable 5% weapon damage up to 50 stacks, which means 250% damage increase
Bully's Bone Knuckles - 5% increased crit chance against Weakened foes
Charred Rabbit's Foot - 5% increased crit chance against Burning foes
Crest of Nilas - 33% damage reduction from Weakened foes
For the weapon enhancement, we are using Call of the Swamp to apply Poison on Charged Attacks.
The Blessings are the following: Full Living, Slaying Servants, Energetic Endings, Mending Wounds, Recalling Bones, Repelling Revivals, Lighter Loads, Deadly Discounts, Dashing Strikes, Rewarding Recycling, Painless Lessons.
The recommended Card is Spirit of Flames, because it charges quickly, it applies Burn and it never misses.
The Stats you want to focus on are Weapon, Conjurations and Luck.