vintage pokemon booster box Legendary Collection Pokémon Pokémon Base Set Booster Pack

When that attacking monster destroys an opponent's monster by battle and sends it to the Graveyard: You can activate this effect

Okay, for this next part, I do want to mention this is about as spoilery as Im going to get

This application of Mystic Mine definitely has potential.

During your end phase if you control "UNSC orbital fleet" or "UNSC field HQ" shuffle it back into your deck

Once you have a Virtual World card on the board, other virtual world cards in your hand can be special summoned through sending other Virtual World cards to the graveyard (which can later be summoned to the field)

When this card is destroyed by battle and sent to the Graveyard, you can Special Summon 1 LIGHT Fairy-Type monster with 1500 or less ATK from the Deck