Have all the students close their eyes or face the back. Place a random creature under each flashcard on the blackboard. Place another copy of 3~4 creatures matching 3~4 of the ones placed under the flashcards on the board. These are the creatures the class is trying to find. 

ALT/HRT sets a timer and calls the target English. STS repeat. When the timer sounds, remove the last called flashcard to reveal the creature underneath the card. If it matches one of the creatures the class is trying to find, class gets 1 point. If not, class gets 0 points.