This build is for those who want to use a staff in a support role in medium to large groups in WvW.
Air-Water-Tempest. (Credit: Chemsorly)
Gear - Valkyrie armour with Zerk weapon, trinkets and celestial back.
Runes - The Superior Rune of Exuberance (Superior Rune of the Pack is a cheaper alternative).
Sigils - Superior Sigils of Bloodlust and Strength.
N.B. When using Bloodlust it should also be on the Trident to keep the stacks when entering/exiting water.
How to play
CC's - Wait for the comm to call for them since you don't want to blow your cooldowns at the initial engagement. Otherwise, freecast to block or funnel the enemy.
Water - If no one is calling them on TS, please get on it (small water for regroups, big water for heavy pressure) to call them out. Overloading water is a good way to provide Frost Aura to allies.
Overloads - Use these whenever they are off cooldown.
Offensive/Defensive changes - If you want to go more offensive, consider swapping Tempest - Invigorating Torrents for Harmonious Conduit to allow overloading Air much closer to the frontline.
Comparison to classic build
Disclaimer: I'm not a theorycrafter and would appreciate any feedback.