While you have no face-up security cards, you can ignore this card's color requirements.
[Security] [Your Turn] All of your Digimon with the [WG] trait gain <Vortex>.
[Main] Add your bottom security card to the hand. Then, place this card face up as the bottom security card.
Security Effect
[Security] You may play 1 [WG] trait level 5 or lower Digimon card from your hand without paying the cost.
Rulings Q&A — 6 entries
Q1Q4609
Is the "while you have no face-up security cards" condition met when I have 0 cards in my security stack?
What happens to cards placed face up in the security stack by effects?
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Official Ruling
They become face-up security cards that remain revealed. Other than rules that specify face-up security cards, the rules apply in the same manner as standard security cards.
What happens upon a security check for a security card that is placed face-up?
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Official Ruling
The check is performed with the card left revealed. Other than rules for cards left revealed, the rules apply in the same manner as standard security checks.