As that trigger resolves, the battle is exiled and then the back face is cast without paying any mana cost which is handy as the back sides dont have mana costs, anyway
Not every card will drop in price, mind you, and once Modern Horizons 3 is fully integrated into the Modern metagame, we may see a smattering of cards actually increase in price
The first two can be Special Summoned only by removing a predetermined number of LIGHT/Fairy and/or DARK/Fiend monsters from the Graveyard, and possess variations on the abilities of the dreaded Chaos duo, with the third negating the activation of certain cards based on what type of monster was Tributed to summon it
This makes them some of the most consistent decks in the entire Commander Format
If you're catching up on The Silo Saga or The Witcher series, boxed sets are discounted and worth adding to your shelf
Regardless of which commader you play, the unearth cards and graveyard recursion makes the deck incredibly resielnt and hard to keep down