Silverdawn tops the weapon ranking for Anastasya, at 139.7% relative damage at R1 in the Personal DPS column, ahead of The First Great Magic, Jade Vista and Breezeborne Refrain. That order is 4pcreverie's damage calcs at KQM standards, rephrased here; every row of it sits under Weapons below.
Run Starspark on Anastasya, with Heart of the Furnace and Disenchantment in Deep Shadow behind it. Main stats are ATK% sands, ATK% goblet, CRIT Rate / CRIT DMG circlet. Roll substats in the order CRIT Rate / CRIT DMG > ATK% > Energy Recharge.
Talent priority is Elemental Burst > Elemental Skill > Normal Attack. The Elemental Burst costs 50 energy, which is what an Energy Recharge target has to clear.
The strongest team is Anastasya, Mitya, Odette and Danica, built around Anastasya: Cryo · Stellar-Conduct.