The Portal V1 ability is one of the coolest and most creative in the game—you basically get a portable dimension. But V2 is boring and buggy. I think a mechanic similar to the “quantum” one would be more fun.
E creates a door to the dimension.
Q creates an exit.
R creates an event, like an earthquake, tsunami, or alien invasion (to keep it fair, disasters can only happen when the ability’s owner is inside the dimension).