Their beauty, with a spectacular foil finish and extended alternate art, limited availability of just 12 per set, and extreme rarity (about 1 in every 72 booster packs) contribute to their high value
Double-faced cards: three clean approaches that work in real life Double-faced cards are mainly a problem in two places: In your library and hand (hidden information) When they change faces (table clarity) Here are the clean options, in order of least-to-most fiddly
In a format like Commander that relies on specific cards, you can easily get it to your hand for use if that card is legendary
Once per turn, you can reveal 1 "Shadow Whisperer" monster from your hand, double this card's ATK until the end phase
For any future playthroughs I am definitely using at least two
So I'd bet that we'll see the time travel mechanic again in Magic some day, when the setting makes sense