I have interviewed several artists associated with Magic the Gathering and its parent company, Wizards of the Coast, in order to get a sense of where the inspiration for the books, scrolls, libraries, archives, and other bibliographic card features come from
None of these cards do a ton for you, but Urtet, Remnant of Memnarch allows you to play the Golgari cards left out by the Jeskai ascendancy to energy dominance
The Mana Battery Cycle There is a mana rock cycle that exists in the format that was printed in Legends and then reprinted in the core set
After he died, a religion known as the "Cult of Krark" was formed around his writings, spreading the word that there was a secret world inside of Mirrodin
This should be no surprise, as most players start out getting drawn to big creatures, burn and tribal