Of course, your ideal first Battle Compressor play consists of Life Dew and two copies of Puzzle of Time -- unless you have some of those cards in your hand or discard pile already
If the cunning opponent controls Trinisphere, and you cast a spell by paying Flashback cost, you will have to pay the Spheres tax if the mana part of the total cost of the spell nets for less than three
For players that may be curious about the most expensive of these cards, providing a list is the exact purpose of this article
A four-mana one-sided Howling Mine that occasionally makes you 1/1s is nothing to sneeze at
Sieges Back from Fate Reforged are a few Siege cards
Black's most expensive cards span three distinct eras: the 1993 Alpha/Beta Power Nine, the 1993 Arabian Nights first expansion (Juzam Djinn, Guardian Beast), and the 1994 Legends third expansion