The Speed Demon
Legendary Creature — Demon{3}{B}{B}5/5
Flying, trample Start your engines! (If you have no speed, it starts at 1. It increases once on each of your turns when an opponent loses life. Max speed is 4.) At the beginning of your end step, you draw X cards and lose X life, where X is your speed.
Colour identity Black · Flying, Trample, Start your engines! · Commander page
In short
The Speed Demon has 6 listed printings; the most valuable is the Borderless · First-Place Foil printing from DFT at US$21.04 on TCGplayer's market price. Prices below are the cheapest in-stock listing in the United States.
Every The Speed Demon printing
Borderless · First-Place Foil
The Speed Demon
DFT · 538
TCGplayer market
US$21.04
First-Place Foil
The Speed Demon
DFT · 453
TCGplayer market
US$8.60
Prerelease
The Speed Demon
PDFT · 105s
Price not tracked
Promo Pack
The Speed Demon
PDFT · 105p
Price not tracked
Borderless
The Speed Demon
DFT · 339
Price not tracked
The Speed Demon
DFT · 105
TCGplayer market
US$0.94