A Twitter user posted what appears to be the images of a new Secret Lair drop containing alternate art shocklands from Magic Online following an update to the client yesterday.
The images of the cards contain the star symbol that other Secret Lair drops use as well as the SLD code in the bottom left. The art on the cards depict different planes and the flavor text on each card also references characters and places that could reinforce the plane setting for each illustration.
Wizards of the Coast (WotC) hasn’t confirmed the drop yet.