Bottomless Pool

When you unlock this door, return up to one target creature to its owner's hand.

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Locker Room

Whenever one or more creatures you control deal combat damage to a player, draw a card

When you unlock this door, return up to one target creature to its owner's hand.
(You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.)

Whenever one or more creatures you control deal combat damage to a player, draw a card.
(You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.)