If they search their library this way, they shuffle
A good playline would be to play Vault Door on four after you've built your board with some characters, followed by either location plus Voyage on turn five to move your character over to it
The enchantment gives every nonland card in your graveyard the escape mechanic, meaning you can recast them by paying their normal mana cost plus exiling three other cards from your graveyard as an additional cost
If an affected permanent changes controllers before its old controller's next untap step, this ability will prevent it from being untapped during its new controller's next untap step
Getting this out early will open strategy opportunities that would otherwise be unavailable to you until later in the game, giving you a great head start
To cast a spell this way, you may choose to pay any alternative costs or optional additional costs the spell may have (such as a kicker cost)