Tesla Coil

 is an agressive unit, which consumes Engineers to produce attack.

Strategy
Tesla Coil initially offers great value in terms of gold for, considering it comes with 2 free Engineers. This benefit must be weighed against the cost required to keep the Tesla Coil firing over the course of the game though, as you likely will have to continuously buy Engineers only to sacrifice them for attack, especially with multiple Coils in play. You should also be wary of your Engineer supply, as when you run out of Engineers to buy your Tesla Coils won't be able to attack anymore.

Tesla Coil has some anti-synergy with itself because the more you have the more Engineers you have to buy every turn just to power them. This means not only that you will run out of supply more quickly, but also that it becomes hard to keep your defense granular, and maybe hard to spend your tech as well (because so much of your gold is being spent on colorless units every turn).

The maximum attack you can get from Tesla Coils in a game is 90, not counting Engineers spent or gained, so, in some sets it's not advisable to start with them.

Because of their need for Engineers, Tesla Coils synergize well with units that produce Engineers like Sentinel and Hellhound. It also has good synergy with units that make a good use of the extra energy, like Galvani Drone, Electrovore or Cauterizer. As it spends Engineers, it is an excellent follow-up to an Antima Comet attack.

Openings
Player 1:
 * DD
 * DD
 * 1) DCB
 * 2) DDS
 * 3) Tesla Coil

Rush timing:
 * DD
 * DC
 * DB
 * 1) Tesla Coil

Player 2: High econ delays buying tech by 1 turn.
 * DD
 * 1) DDC
 * 2) DDB
 * 3) Tesla Coil

Player 2 Synthetizer (2). Player 1 rush having Doomed Drone (1)
 * DD
 * DB
 * 1) DD2
 * 2) Tesla Coil
 * 3) Tesla Coil
 * DD
 * B1
 * 1) 112
 * 2) Tesla Coil
 * 3) Tesla Coil
 * 4) Tesla Coil
 * 5) WE...

Change log

 * October 15th, 2015
 * Cost decreased from 12 to 11.
 * Comes with 2 Engineers instead of 3 when bought.
 * May 23rd, 2015
 * Cost increased from 10 to 12.
 * Comes with 3 Engineers instead of 2 when bought.
 * November 15th, 2014
 * Supply decreased from 10 to 4.
 * September 23rd, 2014
 * Cost changed from 11 to 10.