At the beginning of your combat step it doubles something's size based on that power and then adds haste too
If your life total is brought to 0 or less at the same time that Pitchburn Devils is dealt lethal damage, you lose the game before the ability goes on the stack
The next iteration on the idea was from Alliances (1996), where the Phantasmal Fiend was still black, but the cost for the activation for switching was blue, so essentially while the card was black, the ability was blue, so the effect had already changed colors
Years later the name stuck and the deck-building concept focused on winning through resource denial has only gotten stronger
But the print runs became larger, so youre more likely to stumble across a sealed Beta or Unlimited booster pack than an Alpha one
This strategy can be achieved multiple ways, most commonly with equipment, auras, anthems, pump spells, or a combination of any of these