Edge of Eternities is Magic: The Gathering's first foray into space (in a canon set, anyway)
There were 15 Auras, meaning a total of 31
See, all this swarming is in service of Pumpking the Great Ghost King, who is stellar removal (or a means to reset CotH) that also searches, and his most common target is appropriately Call of the Forgotten
Comprehensive Inspection All slabs are inspected for damage and cleaned thoroughly before we ship
Even though they aren't gone, and...nevermind
While Sarkhan has pretty lousy alternate abilities, Chandras +1 abilities let you pick off smaller creatures or dig towards extra action, both of which are useful at different points in the game