Why are the penguins flashing rainbow?
Solution 1:
The red-and-black penguin in your screenshot is no mere popguin, but a Brit Popguin, ruler of popguinkind, who notably "will continue to power up its allies as long as it's on the battlefield." The glowing shows that the Electro Popguins are being powered up by their emperor. Erase the crown-wearing noise to make the glow fade out.