So I found a thread about OP Engi, then read about Nome's post about official guide about how to counter the spidermine, hope its usefull.
Early Game
- Keep good lane control so you can see where Engineer is at all times.
- Counter-pick Engineer with Ophelia, Warbeast, Balphagore, or any other hero with summons.
- Take unconventional routes to avoid mines.
- If you know where the mines are, don't buy a Revelation Ward just yet. Let him waste his time placing a lot, then buy one to sweep them all up.
- Make use of his lack of Keg/Turret levels to kill him or his lanemate repeatedly. Just don't walk into traps (and they will almost always be obvious).
- Most importantly, don't be dumb.
Mid Game
- Buy more Wards of Revelation.
- Keep jungle entrances and river warded and in sight.
- Buy a Whispering Helm to dominate a creep, then use it to minesweep.
- Buy a Mystic Vestments.
- Start building a Puzzlebox.
Late Game
- Buy more Wards of Revelation.
- If you know where mines are, have high-HP members of the team buy Barbed Armor. Activate as you run into the mines; if there are enough, Engineer will probably instantly die. Repeat enough times and he'll complain on the forums.
- Upgrade your Puzzlebox to 3.
