Advanced Puzzle: Countdown

Advanced Puzzle: Countdown is the twelfth level in the Prismata campaign.

Setup
The player begins with 2 Walls, 6 Drone, a Blastforge, and an Animus.

The opponent begins with 4 Husks, 4 Tarsiers, and 12 Shadowfangs with 10.

Engineer, Wall, and Rhino are available for purchase.

General Tips

 * Notice that you can build exactly 10 Rhinos and your opponent has exactly 20 units, with 1 Health each. This means that you have to build all 10 Rhinos and each has to attack twice before dying or else it's impossible to win.
 * Remember that once your Rhinos have attacked twice, they can defend too, so factor them into your calculations.
 * Don't be afraid to sack a Drone on a key turn. Each Rhino costs 5 Gold and you start the challenge with 6, so even if you lose 1, you can still build a Rhino each turn.
 * Think about your defense very carefully. You need a lot less Walls and Engineers than you think.

Solution 1

 * 1)  6 Drones, build Rhino
 * 2)  with Wall and Rhino,  6 Drones and Rhino, build Rhino and Engineer
 * 3)  with Wall and Rhino,  5 Drones and 2 Rhinos, build Wall
 * 4)  with Engineer, Drone, and Wall,  5 Drones and Rhino, build Rhino,  Husk
 * 5)  with Rhino and Wall,  5 Drones and Rhino, build Rhino,  Tarsier
 * 6)  with Rhino and Wall,  5 Drones and 2 Rhinos, build Rhino,  Tarsier and Shadowfang
 * 7)  with Wall,  5 Drones and 2 Rhinos, build Rhino,  2 Shadowfangs
 * 8)  with Wall,  5 Drones and 2 Rhinos, build Rhino,  2 Shadowfangs
 * 9)  with Wall,  5 Drones and 2 Rhinos, build Rhino,  2 Shadowfangs
 * 10)  with Wall,  5 Drones and 2 Rhinos, build Rhino,  2 Shadowfangs
 * 11)  with 3 Rhinos and Wall,  5 Drones and 2 Rhinos, build Rhino,  2 Shadowfangs
 * 12)  with Rhino and Wall,  2 Rhinos,  Shadowfang and Tarsier
 * 13)  with Wall, Rhino,  Tarsier

Solution 2 (with no Engineers or loss of Drones)

 * 1)  6 Drones, build Rhino
 * 2)  with Wall and Rhino,  6 Drones and Rhino, build Rhino
 * 3)  with Wall and Rhino,  6 Drones and Rhino with 1 stamina left, build Wall
 * 4)  with Wall and Rhino,  6 Drones and Rhino, build Wall
 * 5)  with Rhino and Wall this time letting rhino die, 6 Drones and Rhino, build 2 Rhinos,  Husk
 * 6)  with Wall and Rhino losing wall again,  6 Drones and 2 Rhinos, build Rhino,  2 Tarsiers
 * 7)  with Rhino with no stamina,  6 Drones and 3 Rhinos,  Tarsier and 2 Shadowfangs
 * 8)  with Rhino,  6 Drones and 2 Rhinos, build Rhino,  2 Shadowfangs
 * 9)  with Rhino,  6 Drones and 2 Rhinos, build Rhino,  2 Shadowfangs
 * 10)  with Rhino,  6 Drones and 2 Rhinos, build 2 Rhinos,  2 Shadowfangs
 * 11)  with 5 Rhinos,  6 Drones and 3 Rhinos, build Wall,  3 Shadowfangs
 * 12)  with Wall,  2 Rhinos,  Tarsier and Shadowfang