Sometimes it is backbreaking such as against a Mana Vault however costing three mana makes it far weaker as disruption often being too late to the party
Costing one mana makes it searchable with Urza's Saga in eternal formats and unlike Soul-Guide Lantern, you can exile the graveyard and draw a card at the same time, making it the most effective variant and very similar to Nihil Spellbomb
While many of us can opt into a house rule to allow or disallow silver-bordered cards, players without a regular group must rely upon strangers they encounter in their local game stores
Nothing prevents its owner from venturing into that dungeon again if another spell or ability instructs them to, though they would have to start from the topmost room again
That means you have the greatest potential to find a serious buyer whos ready to pay top dollar for your awesome high-grade slab
Whenever they deal combat damage to a player, you get to choose any number of their abilities