Artemis is a great unit and for many years one of the most banned and dominant characters in the game. Her release marked the start of true cornerstone units. The goddess of the moon can pivot between Brilliance and Hunter, and both Aspects give her a complete toolkit of tempo, pressure, and utility that still feels unique.
In practice, the most common game plan is to abuse Moonlight - Shining through basic-attack chains, enabling repeated assists with Phantom Moon while sustaining allies and keeping offensive momentum. Hunter mode is also very strong in specific drafts because it improves energy flow and turns Hunt of the Moon into a real finisher that punishes defensive setups. On top of that, Divine Deprivation can reset a key enemy state and break turn planning at the worst possible time for the opponent.
The tradeoff is that Artemis usually enters a hard speed contest, so her cosmos build can be expensive and demanding. Even so, she remains totally worth it: she does things no other unit does and continues to be a very solid choice.