
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.
Mausoleum Secrets has 3 printings, first in Guilds of Ravnica (2018). EDHREC ranks it #7,555 among Commander cards. It appears most in Yawgmoth, Thran Physician decks (1,020 on EDHREC). It has 4 official rulings.
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.