
Whenever one or more creature cards are put into your graveyard from anywhere, venture into the dungeonventure into the dungeonTo venture into the dungeon, enter the first room or advance to the next room.. This ability triggers only once each turn. (To venture into the dungeon, enter the first room or advance to the next room.)
Create Undead — Whenever you complete a dungeoncomplete a dungeonYou complete a dungeon when you finish its last room and it leaves the game. Cards can check whether you have done so this game., return target creature card from your graveyard to the battlefield.
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Read from the rules text. A card that enables a keyword makes or is the thing; a card that rewards it gets better when you have it. Two cards interact when one enables what the other rewards.
This card refers to dungeons. These are the dungeon cards you can venture into; taking the initiative always uses Undercity. Dungeons sit outside your deck, so you don't need to add them to it.