The First Sliver
Legendary Creature — Sliver{W}{U}{B}{R}{G}7/7
Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order.) Sliver spells you cast have cascade.
Colour identity Five-color · Cascade · Commander page
In short
The First Sliver has 5 listed printings; the most valuable is the Secret Lair printing from SLD at US$64.53 on TCGplayer's market price. Prices below are the cheapest in-stock listing in the United States.
Every The First Sliver printing
Secret Lair
The First Sliver
SLD · 1371
TCGplayer market
US$64.53
The First Sliver
MH1 · 200
TCGplayer market
US$36.82
Retro Frame
The First Sliver
H1R · 26
TCGplayer market
US$35.07
Retro Frame · Foil Etched
The First Sliver
H1R · 26
TCGplayer market
US$30.25
Future Sight
The First Sliver
PF25 · 3
TCGplayer market
US$27.85