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Mausoleum Secrets [Guilds of Ravnica Prerelease Promos]
| Set: | Guilds of Ravnica Prerelease Promos |
| Type: | Instant |
| Rarity: | Rare |
| Cost: | 1B |
| Colors: | B |
Undergrowth — Search your library for a black card with mana value less than or equal to the number of creature cards in your graveyard, reveal it, put it into your hand, then shuffle.