M. Ost is a very formidable foe, even in comparison to the common R. Ost. He has high health and damage, extremely fast movement speed and attacks, decent range and guaranteed knockback + slow + Curse, all of which allows him to wreak havoc upon your units if not dealt with properly.
He does have a weakness, however, that being a whopping 10 knockbacks. Therefore, if your cats can do enough DPS to M. Ost, he will be knocked back continuously until death, preventing him from causing too much damage.
Ostrich who is also a veteran stand-up comic. An inspiration for younger comedians, but he is becoming more self-conscious of the generation gab in the scene.
Ostrich that inherited old good old ancient comics. It features rich hutomune and funny laughter. Recent severe seed is a generation gap with young partner.
When fighting this enemy, you can use a fairly similar strategy to what you would use against a regular R. Ost. If you have any reasonably strong cats that outrange M. Ost, they should be able to hold him back. Cyberpunk Cat also works very well against him. If the stage gives you the option to stack long-ranged cats, that can also be used to keep M. Ost constantly knocked back.