The AI can't be controlled by teammates, but you might want to check out this idea: https://warlight.uservoice.com/forums/77051-warlight-features/suggestions/1240763-teammate-takes-over-for-booted-surrendered-player
Firstly, it attacks teammates, destroying their chance of a bonus where the border would otherwise be undefended.
View the AI's orders and or out-delay the attack that the AI is making.
Secondly, it doesn't use cards. ever.
The AI uses cards if or when the whole team is completely AI; never uses cards otherwise in team games.