Cheapest priced copy (Reality Fracture Commander): $3.99 at Card Kingdom, near mint, their price list as of .
Jace, Multiverse Architect 
Legendary Planeswalker — Jace · Mythic · Reality Fracture Commander · #1
At the beginning of combat on each opponent's turn, they may pay {2}. If they don't, creatures they control can't attack Jaces you control this turn.
+1: Draw two cards, then put a card from your hand on the bottom of your library.
−3: Exile another target planeswalker or creature you control. Reveal cards from the top of your library until you reveal a creature or planeswalker card. Put that card onto the battlefield and the rest on the bottom of your library in a random order.
Jace, Multiverse Architect can be your commander.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $0.99 to $3.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Reality Fracture Commander | 1 | Mythic | $3.99 | $0.99 |