Indeed, you can get a mage... and watch it get rekt by a medusa or marrow...
Especially since it appears ninjas have a targeting issue, especially in laggy matches, where they will hang up and not strike for an extended period...
You can bring out a Mage in response to wing mass before Chaos brings out a Medusa. Wings cost a lot of gold, massing them makes rushing out a Medusa quite hard. If later in you can bring out a ninja in response to that Medusa.
If Chaos has a Marrow you can get off 1 spell before the reap animation takes your mage, meaning you can poison the whole wing army, which should ensure you win an archer/wing battle.