If you're looking for a general meaning or something else, see the Nephilim entry
Magic The Gathering Aetherdrift Play Booster Box
So by color and rarity count today we have 2 white, 3 blue, 2 black, 6 red and 7 green double sided cards in magic as of now, each one of course is a different rarity that is for sure and each one of these is pretty darn interesting, each one also has a color indicator which indicates what color they are in their night time form, for example since Unholy Fiend is the nighttime form of Cloistered Youth you'd think it was a white card, but it's color indicator is black not white, some may end up having a entirely different color indicator in magic, again introductions to these 20 new cards are not necessary however we've been aware of them for about a week and well some of us already are sick of em, again the rules for the double sided cards are going to be below 711
With a unique take on classic blue theft cards such as Gilded Drake, this enchantment can help you solve that problem by completely swapping the text box of two target creatures for as long as it remains on the battlefield