Playing with Cords

First, play Witches of the Wild on C2. This will kill the Crimson Sentry which is going to damage all bordering units (not enough to kill any of them though as it only does 4 damage). This will convert the Faithless Prophets for the enemy. The drain will also kill the enemy Green Prototypes which will buff the Witches of the Wild. Finally, the latter move forward to C3.

Then, play Blood Ministers on B2, where the Crimson Sentry used to be. This will convert all three bordering units. At this stage, there is only the Earthfathers to kill to complete the puzzle.

This can be achieved by playing Faithless Prophets offensively on D3, who would kill the Earthfathers and convert for the enemy. Finally, Clerics with Cords can be played on D3 as well to convert the Faithless Prophets again, thus reseting the enemy’s frontline.