As a sorcery, you may pay the mana cost of a locked door to unlock it.) When you unlock this door, mill three cards, then return a creature card from your graveyard to the battlefield
Finally, I have Squirreled Away in my collection
It exiles any nonland permanent - that's a brilliant answer for things since you cannot save it by giving it indestructible in response like Flawless Maneuver or with recursion like Academy Ruins, and it's never coming back and sure to head out
The card can also quest for two lore, but we have a feeling that's lower down the priority list than 'wreak havoc'
Interestingly, this card is from set 8, which is a full two sets ahead of the last released set Azurite Sea
The problem with dedicating two cards in your deck this way is that you only have one card left with which to actually win the game