Goals

This build is meant to turn mild mannered Muriel into a lean mean teamfight machine by maxing out the possible buffs she gives to her carry/team.

Crest

Tranquility:

Heal your team more, for more MP, and mana regen for yourself.

Sanctification:

Shield your team more, plus more HP and health regen for yourself.

Both are solid picks that rely on team comp and personal preference.

Early Items

Wellspring and Tainted Totem should be your first items.

Wellspring

For the extra heal on ability cast + mana regen, and it improves your shield power. This helps sustain your carry early on.

Tainted Totem

More HP & Mana, plus more magic power, which Muriel's abilities scale off of. Plus it applies an anti-heal affect for yourself and any ally you heal/shield for all damage types.

Midgame Items

You have a choice here between Crystal Tear, Marshal, or Windcaller depending on your team. Pick two.

Crystal Tear

Great for a carry that uses ability power/MP (ex: Wraith/Grim). Plus, it boosts your heal and shield.

Marshal

Good with a carry that needs attack speed and damage (ex: Sparrow/Kira). It also gives you some mana regen and more ability haste than Tear does, which is always great on Muri.

Windcaller

Great for mobility. If you need to get in/out fast it speeds up yourself and whoever you shield/heal (on 8s cooldown). Plus, it helps with sustaining your mana and gives a small boost to heal/shield power and a lot of MP.

Lategame Items

For this its between better cooldowns and sustain with Astral Catalyst and Vanguardian.

Catalyst

Gives you more mana plus gives you your Ult more often, which is always great, and you get a lot of mana and ability haste.

Vanguardian

Makes you more tanky, plus improves your tenacity if you're getting CC'd a ton. You can also give yourself an allies an armor buff during teamfights, on a 60s cooldown.

Alternate Items

Feel free to sub out the mid/late game items with any of these, depending on your situation and preference. However, this will reduce the max buffs you can provide for the team (except for Requiem).

Requiem

Gives you extra HP & Mana regen, plus heal and shield power. Allies get more phys power and a bit of lifesteal when fully build.
Downside: Hallowed Braid must be purchased early for max benefit from Elegy.

Timewarp

Get your abilities back faster, plus gain more MP and mana regen.
Downside: no buffs for your team.

Galaxy Greaves

More armor, mana regen, and mobility.
Downside: no buffs for your team.

Dreambinder

More HP & MP, plus a bit of tenacity. Extra slow for enemies hit by Serenity or your bubble.
Downside: no direct buffs for your team.

Spellbreaker

Extra magic armor and MP. If you feel like you're being burst down by abilities, this one should help.
Downside: no buffs for your team.