The mana and equip costs are steep, but the fact that you can make as many treasure tokens as damage done to a player by the equipped creature is worth it
For years, there werent a lot of ways to abuse this land, but with the printing of The Gitrog Monster and Titania, Protector of Argoth and the additional redundancy that Ramnunap Excavator adds to Crucible of Worlds style land recursion, its relatively easy for a focused Commander list to negate the downside on Lotus Vale and turn it into a permanent Black Lotus level ramp spell that cant easily be dealt with
As I've already mentioned multiple times, Final Fantasy is loaded with legend cards, and this one of the best ways to take advantage of them
Hes one of my absolute favorite designs among the new commanders in these precons
While it might happen for some unpopular Secret Lair drops (the foil basic lands were considered to be one of the worst of the original drops, which might help explain why it is the most valuable todayfewer copies of the foil snow-covered basics are on the market), in general, I'd expect most Secret Lair cards to mirror their original non-foil printing in terms of price