12 cards where the illustration contains “megalith”

Ancient Amphitheater (Lorwyn #266)
Castle Garenbrig (Throne of Eldraine #240)
Dolmen Gate (Lorwyn #256)
Eager Cadet (Starter 1999 #15)
Forest (Throne of Eldraine #269)
Keldon Megaliths (Future Sight #170)
Knight Errant (Seventh Edition #24)
Magus of the Moon (Future Sight #101)
Merchant of the Vale // Haggle (Throne of Eldraine #131)
Shepherd of the Flock // Usher to Safety (Throne of Eldraine #28)
Soulcatchers' Aerie (Judgment #25)
Time Walk (Limited Edition Alpha #83)

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