As of late 2020, Engolo is not restricted anymore. This allowed it to be one of the most splashed breaker across the board, along with Paperclip and Aumakua.
Why is it so much use? Two words : early aggression. Engolo allow the runner to run and facecheck any ice. Since you can color the ice as Code Gate, you are assured to be able to interact with it the first time. This speed up the setup of the runner considerably. Best of all, you only need that one card, not any other combo. Also, Engolo is the only non AI that can interact with trap ices, because it can change the trap type to Code Gate.
Did I mention it is also an absolute beast of a breaker. 2 creds or get strenght 6! In the current meta, there is only 12 ices stronger than that (and 149 equal or weaker than str 6). You could have only Engolo and Pelangi and be able to run a server with 4 ices.
The drawback for it is 2 MU and 4 influences. If you have means to tutor the breaker (Special Order, Gachapon, etc.), it is easy to have only one copy in the deck and still run fine.
Engolo pairs well with Dinosaurus or Gebrselassie. Dinosaurus push the strenght to 4, allowing you to interact with 110 ices without boosting. Gebrselassie allow you to keep the strenght boost to run multiple ices, keeping that low cost to boost that much longer.
In my opinion, Engolo is probably the best breaker of the game, for its strenght and diversity and lack of real problem (no viruses, can interact with anything, not an AI). At a cost of 5, it is a bargain for what it provide.