Mobility is essential for Artificer because of the fact that that she is very squishy. She has mediocre health so movement speed is needed for her to survive. (Paul's Goat Hoof, Energy Drink, Hopoo Feather, etc.)
Defensive items are also essential for Artificer because she is extremely squishy early game. She can get one shot easily late game so she needs certain items like Tougher Times to block these attacks. Old War Stealthkit is also another good one because it can cause her to turn invincible after taking a large amount of damage. (Tougher Times, Old War Stealthkit, Personal Shield Generator, Medkit, etc.)
This item increases Artificer's health which is the main item to keep her alive.
This item gives Artificer multiple Nova-Bombs which drastically increases her dps.
A black hole that brings all the enemies towards it, which is a perfect combo with her Nova-Bombs.
This item adds charges to her Primordial Cube.
Basically causes an explosion after enemies die, even more AoE damage.
Killing an enemy ignites all enemies in a certain area, AoE damage.
Increases the amount of damage you deal to bosses. (Essential late game to dish out that extra damage)