The Cleric
The Cleric is an Act 1 event where a friendly cleric offers two services for gold: healing (heal 20% of your max HP for 35 gold) and card removal (remove a card from your deck for 50 gold). Both services can be purchased if you have sufficient gold. The event does not require combat or any other sacrifice beyond the gold cost.
The Cleric is a strong early-game event, particularly the card removal option. Removing a Strike or Curse for 50 gold in Act 1 is generally excellent value since the shop charges more for removal later. If your HP is low and you have the gold, the healing option is also worthwhile. Having both available makes this one of the most straightforwardly positive events in Act 1. The main downside is simply the gold cost, which may impact your ability to purchase from shops.