When using multiple Wardens first of which has non-zero attack, AI should target a non-flying creature.
Right now it's just first Warden uses "guard" on non-frozen/non-delayed creature with largest attack.
In my case, first Warden had 19 attack which could've devastated my deck but AI wasted it on "delaying" a flying creature which had largest attack.
Needless to say that AI hasn't considered blessing other Wardens it had...