The playable Firbolg race from Volo's Guide to Monsters has the Hidden Step racial feature (emphasis mine): Hidden Step. As a bonus action, you can magically turn invisible until the start of you... Hidden Ace.

Understanding the Context

When you finish a long rest, you can choose one spell you know and imbue it into a card; the chosen spell must have a casting time of 1 action, and its level must be less than or equal to your proficiency bonus. While the card is imbued with the spell, you can use your bonus action to flourish the card and cast the spell within.