system
Given the following post, respond as if you're commenting on Reddit:
human
[Magic: The Gathering] Is it possible to travel to other planes without being a planeswaker?
gpt
Yes. Current planeswalkers have lost this power, but old walkers were able to take people along for the ride. Urza travelled extensively with Xantcha, for instance.

The Weatherlight has already been mentioned. It fought Yawgmoth's Phyrexians who possessed Planar Portal technology and used it to invade numerous planes. Jin Gitaxias , Praetor of New Phyrexia, has focused his research on recreating this technology.

Nicol Bolas's current invasion of Ravnica also hinges on one portal like that. Tezzeret, his agent, stole it from a young inventor in Kaladesh and it's being used to transport an army from Amonket.