In my opinion instead of taking the bonuses from your ally you should focus on bringing the fight to him!
You have 2 gift cards in this level.
Use both gifts card to shift the focus of your ally from expanding vs neutrals to fighting the enemy team. This should get you an easy 16-18 turns win.
Use 1st gift card on ally and 2nd gift card on the red opponent. This forces him to fight your team instead of expanding. With good strategy and a bit of luck you can aim for 11-13 turns win.
Edited 3/12/2020 16:54:36