<span style="display:none;"✨
Usage:
{{NeedsEffect|<effect name>}}
where
{{NeedsEffect|Bike}}
will return <span style="display:none;"Bike✨,
{{NeedsEffect|Stretch, Spring, Glasses|And}}
will return <span style="display:none;"Stretch, Spring, Glasses✨ (note that And is optional, as that is the default value of the second argument),
{{NeedsEffect|Child, Fairy|Or}}
will return <span style="display:none;"Child, Fairy✨.