Maybe I misunderstand how tags work but I thought the idea is that they should be generic terms that not only match one game system, and you can combine them, e.g. if you have a spell trap, use
spellstraps (66 overlap out of 186 for traps, about 30%), so you likewise could use
portalsteleportation if your question were about that kind of portal, or
portalsplanes if it is about planar portals.