I dealt with a 15-power Arnaghad earlier today with a 6-power Anséis with a shield that was already on the board, and the opponent conceded. Concerning Henrietta, I assembled a Pincer Maneuver NR deck specifically because it's mostly useless to the NG player, given he shouldn't have many NR units in his deck to choose from. I had quite a bit of success wtih that deck, despite giving little faith to that particular leader ability (I changed my mind). Ironically, never ran into anyone using Henrietta with the deck created to nullify her.Anna is literal garbage, just like Arnaghad is and he had his own set of rage threads before he came out
Thus, these are powerful cards, but they can be dealt with once you are willing to change your archetype to face them.