Everyone who has watched EU mAT probably noticed that mirage with portal is, unfortunately, still playable. We know of at least (and at most) one person who can play it in high level without getting stomped. You can put it on a node and leave so you threaten decap, forcing one player to sit there for a long time. Otherwise you can use the portal to quickly bomb someone with your team to gain huge advantage. We saw similar tactics repeatedly used in mAT. It makes you and your team be on two nodes at the same time with no drawback. Literally the strongest utility skill in the game, and only one person needs to run it. This means it wastes only 1 utility slot for 15 slots for your team in total.