Cardio Zombie
Credit goes to u/Haemophilus_EA from Reddit.
Cardio Zombie is a brand-new type of zombie that is very difficult to take down, is worth a large amount of points but also is able to buff up fellow zombies nearby them and a general added challenge all round.
Periodically Cardio Zombie will throw out Buffing Brains to other zombies, usually to the zombie closest to your house, which increases the size, damage and speed of those zombies. That said those juiced up zombies are worth additional points when you deliver the KO on them.
Cardio Zombie is immune to a bunch of stuff, however it’s able to be poisoned, chilled and slowed.
Another important thing to know about Cardio Zombie is that there are 3 stages to taking ‘em down. For applicable matches, each stage for Cardio Zombie lasts a limited time, during that time you will be able to do damage to him. Upon their 3rd appearance you will be able to finally take them down for good!
Additionally Cardio is capable of crushing plants in their path, devastating them in the process so you better watch out they don’t get trampled!
Read more here.