Some spells, such as the Mini Mushroom (Snake Magic), give you a chance of Shrinking a monster. 


When a monster is Shrunk, its size is reduced. A mushroom icon and a counter appear in front of it, showing how many cards you can draw before the Shrinking effect ends.


To complete the challenge that asks you to “Defeat X Shrunk monsters", you must kill a monster WHILE it is still Shrunk.


Note: If the monster is no longer shrunk when killed, then it WON'T count for the challenge.

Learn more about: How do I Shrink a monster?