It does require Garnet to attack, but if a lot of lore counters get removed at once, Garnet will get massive stat boosts
In fact, you might even be casting it to protect your stuff from your own land destruction or board wipes
Arrives safely packed in a deckbox, makes a great gift
Thanks to this, characters and creatures that usually dont have the ability to travel between planes - essentially, anyone who isnt a planeswalker - suddenly have the chance to cross over from one plane to another
Just dont pay too much attention to the manga panels in the background
In terms of actually rolling the Planar Die, on each players turn, that player gets one free roll of the planar die