Heartichoke

Heartichoke is a Plant Character from the Solar class. It costs 4 Sun to play. It has 3 Strength and 4 Health. It has the ability "Whenever a Plant or your Hero is healed, do that much damage to the Zombie Hero." It is from the Leafy and Flower tribes. It is a Galactic Rare card.

Using
Place it in a Venus Flytraplanet to endlessly heal your Hero and damage your opponent's Hero, until they block it with their Super-Block meter.

Alternatively, you can play it in a Planet of the Grapes and play an Aloesaurus nearby, so when you draw your next card the Aloesaurus will heal you, causing the Heartichoke to do damage, causing the Planet of the Grapes to draw a card, and so on. This variation is more expensive, and is usually only possible as Rose, but allows you to draw cards and heal all Plants as well as healing your Hero.

Fighting
Destroy it quickly so your opponent doesn't use a healing loop. You could use Knockout or Locust Swarm.