While you have no face-up security cards, you can ignore this card's color requirements.

[Security] [All Turns] All of your black or red [TS] trait Digimon
gain [Blocker]. While you have [Vulcanusmon), they also gain [Link +1].

[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 black or red [TS] trait Digimon card from your hand with the cost reduced by 3.

[Security] You may play 1 level 4 or lower black or red [TS] trait Digimon card from your hand or trash without paying the cost.