Toxic Gas

Toxic Gas is a Common Shadow Trick in Plants vs. Zombies Heroes. It costs 2 Sun to play and says" All plants and zombies get -2 strength. Draw a card."

Origins
Toxic Gas is a straight forward name with no hidden references or meaning(s).

The animation after playing Toxic Gas is similar to Super Stench and Spoil Soil.

Strategy
It is a good idea to play this when you have little to no plants on the field, so that mostly, or in some cases, only zombies are affected. Do not play when there are a lot of plants on the field.

You can also use this card on a bunch of plants with 1 strength to bring them down to having 0 strength so that they can be buffed by Spineapple.

Trivia

 * The card's description seems redundant, but that simply part of the joke.