This is my current Magicka Warden build. By no means am I sweaty enough to min/max every little mathematical detail, but it works well for 1vX scenarios in open world and I have a lot of fun with it. Great sustain and good burst.
Gear
5 Shacklebreaker (Set allows you to run Witchmother having good stam regen and adds to our Magicka pool)
5 Necro (The peanut butter to Magicka Warden's jelly)
2 Blood Spawn (Great Ult regen and increased tankiness) Engine Guardian could work here. Skoria would be great burst when or if they fix Fletcher as a DoT and not direct damage.
2 Shacklebreaker Swords (Sharpened PreHorns, Nirn or Precise PostHorns)
3 Light Shacklebreaker Body (Impen, Mag Enchants)
2 Light Necro Body (Impen, Mag Enchants)
3 Necro Jewelry (1 Spell Reduction, 2 Mag Recovery)
1 Light Bloodspawn Helm (Infused, Mag Enchant)
1 Light Bloodspawn Shoulder (Divines, Mag Enchant)
1 Maelstrom Restoration Staff (Decisive/Powered/Precise/Defending)
Of course you can do 5/1/1 for for max H/S/M with Undaunted passives, but this is a newer character that does not have them yet.
In addition, my stat sheet is with 6L 1H, 5 Impen, 1 Divines (Heavy Head), 1 Infused (Light Shoulders) and everything purple except for the weapons which are gold.
Skills
DW Bar
1: Screaming Cliff Racer (Bread and Butter Spammable)
2: Deep Fissure (Stun and Burst)
3: Fletcher Infection (DoT, Added Pressure, Direct Damage)
4: Inner Light (5% Max Magicka *+2% Max and 2% Regen w/ passives, Spell Crit, Stealth Pull)
5: Blue Betty (+20% Spell Damage, Magicka Regen, Pet)
Ult: Northern Storm (8% Max Magicka)
Restoration Bar
1: Dampen Magicka (Almost 10k Tooltip Shield in Cyro)
2: Leeching Vines (Heal, Lifesteal) *You can also slot Corrupted Pollen, Shimmering Shield or even Rapid Regen to work with Maelstrom Resto*
3: Ice Fortress (Major Resolve, Major Ward, Minor Protection)
4: Healing Ward (Shield, Heal)
5: Bird of Prey (Major Expedition *Movement*, Major Endurance, Minor Beserk)
Ult: Enchanted Forest (Cheap Heal, Ult Regen)
Food/Mundus
Witchmother's Brew or TriStat if you can't manage stamina.
Atronach for Bloodspawn or Shadow for Engine Guardian
Thank you kindly and be sure to catch me on Twitch if you care to.