Unlock the Vault is a spell card.
How to Get Edit
Generally, it is best to have all three types of cards within your deck.
For a midrange strategy, you generally want to guarantee value, and while relic weapons readily go to the void, if you're not running self-mill or discard, it can be difficult to get a relic into the void. Some relics like Mistrust, Wurmstone, and Unspeakable Torment sacrifice themselves readily, and bring a good amount of value when brought back.
|1.50.0...||Released in Echoes of Eternity.|