For just one summoner life point and this card, you get two commons of your choice from your discard pile. Here is another event where you should play both copies every game. In general, you should bring Royal Warriors back, but only if you can afford them, which honestly, often you may not be able to. As such, a quality retrieval is one Royal Warrior and one Devout Cultist. When in doubt, that is a very safe fetch. Sometimes, you may recur Sacral Priests.

In reality, priests are the best investment you can make if you can make use of them. The reason it is not strongly suggested to retrieve priests is that it is very hard already to make use of all 4 priests in the deck, as they require a lot of movement and proper positioning to be useful. But if you can find a use for more Sacral Priests, it is definitely worth getting them back.