Ifa's healing as an Anemo DPS by itself is generally not enough to fulfill Furina's Fanfare, so it's recommended to pair him with another healer, most notably being Sayu.
Regarding Weapon Choices:
Cashflow Supervision: When HP loss is present (notably with Furina), this weapon becomes Ifa's best in slot.
The Widsith: At [R5], this weapon will perform roughly equal to and its similar ranking options.
Regarding Artifact Choices:
Sets
Viridescent Venerer (4): Prioritize this set if no one else holds it.
ⓘ
Indicates important notes at the bottom of the page.
Ifa uses his Elemental Mastery scalings to provide teamwide healing while driving reactions on-field. He can assist in permanently tranquilizing his foes by buffing the Swirl and Electro-Charged reactions, based on the total number of Nightsoul Points shared across the entire team, up to a maximum of 150 points (200 if Ifa is [C2]). For this reason, it is highly recommended to pair Ifa with Ororon.
Regarding Weapon Choices:
Weapon options below do not improve Ifa's healing capabilities.
Sacrificial Fragments: While having a similar DMG output as , this weapon will provide more total healing over your rotations.
Thrilling Tales of Dragon Slayers: This weapon is a support option to help boost the ATK% of your other off-field DPS's, notably Fischl, Xingqiu, and Ororon.
Regarding Artifact Choices:
Substats
Energy Recharge: Prioritize until requirements are met.