It is based on the many events that happened during the Earth's history with the same name.
One of the zombies' hands grabbing a drooping flower resembles the loading bar and the application icon in the original Plants vs. Zombies.
Statistics
Class: Beastly
Tribe: History Trick
Ability: A Plant gets -2/-2. All other copies of that Plant also get -2/-2.
Set - Rarity: Colossal - Super-Rare
Card description
Sometimes the evolutionary tree withers at the root.
Update history
Update 1.22.12
Added to the game.
Strategies
With
Giving a plant -2/-2 for only 2 brains is already a cost-effective trick. And if there happens to be two or more of the same plant, this trick becomes even better. This trick is especially great against decks that rely on making multiple of the same plant, such as Pineclone, Snake Grass, Clique Peas (although it's better to use destroy effects on them instead), and Puff-Shroom swarm decks. The Smash can use this so he can destroy all Pineclones on the field with a single Weed Spray, while Electric Boogaloo can combine this with The Chickening or Fireworks Zombie. However, playing two Extinction Events is cheaper, if possible.
It is also important to remember that, although they appear similar, the plants made by Pair of Pears and Shroom for Two do not count as the same plant.
Against
While it isn't possible to stop your opponent from playing this other than by playing Brainana or having an Umbrella Leaf, having a diverse roster of plants or transforming cards is the best way to mitigate its effect. Bear in mind that its primary effect is still somewhat formidable, however.
Although multiple zombie arms are seen on the card and statistics, when Extinction Event is actually played, only one zombie arm, the one grabbing the flower, appears.
When it is played, the animation will play twice if there is more than one copy of the target on the field.