Techies

Ferry some health consumables with your courier to use Blast Off! frequently.

Blast Off! destroys trees which can be useful against certain heroes.

Look to place a couple of Proximity Mines around portals for a surprise burst on enemies using them.

Drop or backpack items that provide you with mana before using Arcane Boots or Soul Ring.

Sticky Bombs and Proximity Mines provide limited vision so you can scout pillars, runes or Roshan pit.

Consider smoking yourself onto the opponents' side of the map to mine aggressively. Bring an observer as well.

Look for pickoffs or join teamfights with your massive burst potential.

If your teammates are pressuring, move with them, mine around them and Blast Off! when opponents clump up.

Place a couple of Proximity Mines at the entrance of Roshan pit to scout enemy movement.

Pick up Aghanims Shard in the late game for some extra damage on Reactive Tazer.

Consider using Force Staff on enemy heroes to push them onto high grounds where you have Proximity Mines.

Play aggressively in lanes and the enemy jungle with your level 7 as you have massive kill potential.

With your Ethereal Blade, you can burst down just about any hero on the map with your combo.

Against Techies, deliver extra consumables and an Observer Ward to keep track of him.

Proximity Mines explode 1 seconds after you hear the beep. Destroy them or move away quickly.

Keep track of Techies' movements and notice which part of the map is being mined.

Avoid walking up highground or in Roshpit without vision. You might run into mines.

Magic resistance items, Black King Bar and Aeon Disk are great against Techies to avoid getting bursted.

Make it tricky for Techies to land Sticky Bombs on you by making sharp turns.