Superpower cards are items that can be used to fight Super Villains that spawn in the world by using a Crime Wave. There are 4 different elements: Lightning, Ice, Fire and Muscle, and there are different recipes depending on elements. It used to be farmable but has been nerfed.
Sample In-Game Description
Note that text in bold vary depending on the Superpower Card.
This is a Fire Superpower card for use in fighting crime. You can also place it as a block! Card Effect: Ignite yourself, healing 1 damage, and your opponent takes 1 damage if they hit you in the next 3 turns.
Rarity: 37
To grow, plant a Fire Superpower Card Seed. (Or splice a Card Block Seed with a Red Block Seed)
A tree of this type can bear surprising fruit!
This item can be placed in two directions, depending on your facing.
Recipes
Card Block + Yellow Block = Lightning Superpower Card
Card Block + Aqua Block = Ice Superpower Card
Card Block + Red Block = Fire Superpower Card
Card Block + Green Block = Muscle Superpower Card
There is a slight bug on the display of the Lightning Superpower Card Tree while growing.