![Mausoleum Secrets [Guilds of Ravnica Prerelease Promos]](https://cdn.shopify.com/s/files/1/0451/3388/9694/files/c7dc53dd-0fba-507a-aefb-89162a2057e5.jpg?v=1720181264)
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.