Double blue is a real chore to get online and demands too much of most affinity mana bases
Gallery and List of Cave Cards Brass's Tunnel-Grinder / Tecutlan, the Searing Rift Captivating Cave Cavernous Maw Dowsing Device / Geode Grotto Echoing Cavern Echoing Deeps Forgotten Monument Grasping Shadows / Shadows' Lair Hidden Courtyard Hidden Cataract Hidden Necropolis Hidden Nursery Hidden Volcano Pit of Offerings Promising Vein Secret Tunnel Sunken Citadel Sunken Citadel Tarrian's Journal / The Tomb of Aclazotz Twists and Turns / Mycoid Maze Urza's Cave Volatile Fault Best Cave Cards As a land that can copy other lands in any graveyard, Echoing Deeps pops up occasionally, and is not overpowered
A card like Kenrith, the Returned King has black in its color identity but it isnt a black creature
The most valuable of these is the Korean one, which sits at a market price of nearly $180 on TCGplayer
Finally, its a 2/4, so its not like youve spent 3 mana to cast an artifact that doesnt affect the board
Conversely, your opponents can barely use their planeswalkers or infect creatures at all
