Notably, if you arent in a dungeon and an effect instructs you to venture into the dungeon (not venture into Undercity), you cant start Undercity
Of course, the fact that you can tune it to the situation somewhat helps as well
The owner can recast it, but it's temporarily out of play, which can be a significant tempo setback for your opponent
Gandalf, Goblin's Bane arrives as one of the set's mono-red adventure creatures
Kess, Dissident Mage is essentially a better version of him (you can't cast instants on opponents' turns), but cheaper and has access to Red
Like many geeky 90s kids, I grew up watching Star Trek: The Next Generation and I was 9 years old when Star Wars: Episode I was in the cinema