It's a port of a Nintendo 3DS title that actually works well on Android
Its appearances in the rest of the plane are rare and typically are a sign of some massive shift occurring in the spirit realm
Carmen does cost five, though, so the rest of your deck should be filled with equal amounts of recursion (Sevinnes Reclamation et al), ramp (Ancient Tomb, Sword of the Animist) and evasive bodies that can also grow tall (Voldaren Bloodcaster, Liberator, Urzas Battlethopter, Serra Ascendant)
Prices of Warhammer 40,000 cards began to decrease slightly following the previews
The name of the deck is because of the card Vivien on the Hunt that we use in a similar way as we did years ago with Birthing Pod, a card actually ban in Modern