"Sneak Peek" will only appear at a certain rate during the campaign.
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During the Sneak Peek campaign period, the message "A chance for sneak peeks!" will be displayed on the "Wonder Pick" section of the home screen.
When this message is displayed, Sneak Peek will occur at a certain rate if you try the Wonder Pick.
The chances for the occurrence of the Sneak Peek will be determined when you select the Wonder Pick you wish to try and press the "OK" button.
Therefore, you are unable to know whether the Sneak Peek will occur until you press the "OK" button.
When the Sneak Peek occurs, the effect in the screenshot below will be displayed during card selection.
If the Sneak Peek has not occurred, the relevant effect will not be displayed and the Wonder Pick will continue as usual.