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