As far as the Guildmaster’s Guide is concerned, Ravnica is part of the D&D cosmology so the spell works as written. If you want to situate your D&D game in the Magic multiverse, you can alter that. Plane Shift: Amonkhet has some explorations of Magic Planeswalking. #wotcstaff
— James Wyatt (@aquelajames) December 31, 2018
What happens when a wizard on Ravnica casts “Plane Shift”? Is there a cosmology?
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