Cheapest priced copy (Commander Masters): $14.99 at Card Kingdom, near mint, their price list as of .
Onakke Oathkeeper 
Creature — Ogre Spirit · 0/4 · Rare · Commander Masters · #755
Creatures can't attack planeswalkers you control unless their controller pays {1} for each creature they control that's attacking a planeswalker you control.
{4}{W}{W}, Exile this card from your graveyard: Return target planeswalker card from your graveyard to the battlefield.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $12.99 to $14.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander Masters | 722 | Rare | $14.99 | — |
| Commander Masters | 755 | Rare | $14.99 | $12.99Out of stock |
One ruling from Wizards of the Coast
- 28 July 2023In a Two-Headed Giant game, creatures can attack planeswalkers your teammate controls without requiring a mana payment.