Deliverance has a use case: scenarios that when you advance the act or agenda, you shuffle in new cards. Over the years, a lot of boss monsters come with treacheries that summon them, even if you defeat them once. With this card, you get to delay that.
Deliverance will help with any advancement that shuffles encounter back into the deck, but with a cost of 3XP and a surging encounter, it's a high price to pay so that you don’t see certain encounters again. If you don’t know what’s coming, it’s hard to say that “later” will be worse than “now”.