Equivalent cards to “Assassin Den” (a black land) could be:
- “Cabal Stronghold” – taps for colorless, and can generate mana for swamps.
- “Barren Moor” – a black land with cycling, offers mana and card draw.
- “Bojuka Bog” – black land, exiles graveyard when it enters.
- “Witch's Cottage” – black land, puts a creature card from graveyard on top of your library.
All are black utility lands with unique abilities.
