While you have no face-up security cards, you can ignore this card's color requirements.
[Security] [Your Turn] All of your red or blue [TS] trait Digimon gain <Alliance>. While you have [Apollomon] or [Dianamon], they also gain <Rush>.
[Main] Add your bottom security card to the hand and place this card face up as the bottom security card. Then, you may play 1 red or blue [TS] trait Digimon card from your hand with the cost reduced by 3.
Security Effect
[Security] You may play 1 level 4 or lower red or blue [TS] trait Digimon card from your hand or trash without paying the cost.
Rulings Q&A — 6 entries
Q1Q6444
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?
Show ruling
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.