Like with all collectible cards, quality is key
Halana isnt going to get out of control, but shes going to provide you with solid value when you need it
Looking slightly deeper, Mew [Celebrations] might see a bit more play with the release of this card, Beach Court might end up being a suitable replacement for Air Balloon [Sword and Shield], and this could be a counter to control decks bringing up your Pokemon with Bosss Orders
Brilliant Stars Brilliant Stars has had a long time to settle, so the value of these cards are essentially set
The top decks can play through an Imperm, Veiler or anything else in that vicinity no problem (and a good amount of the times even two), so if something like that ended up being your only answer to stop your opponent, you were often likely better off having another engine card or something else altogether instead