Cheapest priced copy (Modern Horizons): $0.49 at Card Kingdom, near mint, their price list as of .
Planebound Accomplice 
Creature — Human Wizard · 1/3 · Rare · Modern Horizons · #140
{R}: You may put a planeswalker card from your hand onto the battlefield. Sacrifice it at the beginning of the next end step.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $0.49 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Modern Horizons | 140 | Rare | $0.49 | $0.79 |
One ruling from Wizards of the Coast
- 14 June 2019At the beginning of the next end step, you’ll sacrifice the planeswalker if it’s still on the battlefield, even if Planebound Accomplice has left the battlefield.