40 cards where the set is “sld” and (the collector number >= 540 and the collector number <= 580)

Plains (Secret Lair Drop #540)
Plains (Secret Lair Drop #541)
Plains (Secret Lair Drop #542)
Plains (Secret Lair Drop #543)
Plains (Secret Lair Drop #544)
Plains (Secret Lair Drop #545)
Plains (Secret Lair Drop #546)
Plains (Secret Lair Drop #547)
Island (Secret Lair Drop #548)
Island (Secret Lair Drop #549)
Island (Secret Lair Drop #550)
Island (Secret Lair Drop #551)
Island (Secret Lair Drop #552)
Island (Secret Lair Drop #553)
Island (Secret Lair Drop #554)
Island (Secret Lair Drop #555)
Swamp (Secret Lair Drop #556)
Swamp (Secret Lair Drop #557)
Swamp (Secret Lair Drop #558)
Swamp (Secret Lair Drop #559)
Swamp (Secret Lair Drop #560)
Swamp (Secret Lair Drop #561)
Swamp (Secret Lair Drop #562)
Swamp (Secret Lair Drop #563)
Mountain (Secret Lair Drop #564)
Mountain (Secret Lair Drop #565)
Mountain (Secret Lair Drop #566)
Mountain (Secret Lair Drop #567)
Mountain (Secret Lair Drop #568)
Mountain (Secret Lair Drop #569)
Mountain (Secret Lair Drop #570)
Mountain (Secret Lair Drop #571)
Forest (Secret Lair Drop #572)
Forest (Secret Lair Drop #573)
Forest (Secret Lair Drop #574)
Forest (Secret Lair Drop #575)
Forest (Secret Lair Drop #576)
Forest (Secret Lair Drop #577)
Forest (Secret Lair Drop #578)
Forest (Secret Lair Drop #579)

It is the moment of discovery, the triumph of the mind, and the end of these results.