I find it that it's easier to sort artifacts by the target...

However, it would be better if it would sort by both. For example, if I sorted by target, everything under "Your Planet" would also be sorted by alphabetical order as well....

Example of Artifact List:

Artifact Target (actions not included because of the irrelevance)
Engineered Virus Enemy Planet
Ion Storm Charge Enemy Planet
Unstable Wormhole Emitter Enemy Planet
Chaostatic Inhibitor Enemy Player
Containment Missile Enemy Player
Spy Prove-Weapons Enemy Player
BM50 Convoy Shuttle Player
Calming Amplifier Player
Draanik Power Core Player

etc etc...

shift click the heading for secondary sorting

Or...I dunno...type something in the filter box?