Massive health, deadly attack power, somewhat short range to bust past your Cats, fast attack speed, and area attack make this enemy very hard to kill.
Yet another entry in the "powerful and fast enemy" category, Beefcake Cat is a force to be reckoned with at the best of times. The easiest way to kill it is by using long ranged attackers (such as Radiant Aphrodite and Windy), and if you have a slow or freeze unit that affects Floating, use them unless they get outranged.