When is the timing of this card effect [Hand] [Main] activated?
This effect will be activated during the Main Phase, by revealing this card from your hand.
Can I reveal this card in my hand if I don't want to pay 1 memory?
Yes, you can reveal this card and not pay the cost. The card will be returned to your hand.
Can I reveal this card in my hand if I don't have a Digimon [Justimon] or [Raidenmon] in its name in play?
No, you must fulfil the condition to reveal this card from your hand.