Concerns of The Deep? I'm Cubin'

Buy left to right
Monster Rounds will allow you to keep the Troopers at bay, Arcane Surge is used to empower your next ability, Guardian Ward will allow you to keep your laning partner safe when they go in, or try to get out
Feel free to grab an Extra Starter for more healing.

Healing Rite turns later into Rescue Beam
Pick Restorative Locket if the enemy spam abilities
Rebuttal if your enemies melee a lot
Extra Regen for more passive regen.

Buy left to right
Use Rescue Beam on someone in The Cube (2) to pull them to you safely! Positioning is key, so always try to remain behind your allies rather than in front of them
Use Divine Barrier on allies to give them a barrier or cleanse them of Debuffs, like Infernus' burn for example! Do NOT use it on someone in The Cube (2), the barrier still takes damage.

If you happen to be dying a lot, or simply taking way too much damage, you should consider one (or more!) of those items.

You can grab Alchemical Fire or another Active from the lists on the right
If there are not enough gun-oriented heroes on your team, or too much mobility on the enemy team, do not get Alchemical Fire
You can consider some of the Alchemical Fire Debuffs items below to empower Alchemical Fire with various debuffs if you bought it!

These will help your team take down strong opponents easily! Read each annotations to know what to pick against who you're facing! Recommendation: Spirit Sap & Silence Wave or Knockdown.

All of those items will trigger once an enemy steps on the fire of Alchemical Fire or when you hit them with Splatter (1)! Recommendation: Suppressor & Healbane.

These actives can give your team a huge advantage during a fight! Heroic Aura to help your gun carry, Scourge to help your frontliner, or Echo Shard for DOUBLE Cube (2)!

These items are NOT part of the build but can be bought to create a playstyle that suits you more
Consider Healing Tempo if you have Healing Nova!