Cheapest priced copy (Theros Beyond Death Promos): $0.49 at Card Kingdom, near mint, their price list as of .
Eidolon of Obstruction 
Enchantment Creature — Spirit · 2/1 · Rare · Theros Beyond Death · #299
First strike
Loyalty abilities of planeswalkers your opponents control cost {1} more to activate.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
4 printings · $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Theros Beyond Death Promos | 12p | Rare | $0.49 | $0.49 |
| Theros Beyond Death Promos | 12s | Rare | — | $0.49 |
| Theros Beyond Death | 12 | Rare | $0.49 | $0.49 |
| Theros Beyond Death | 299 | Rare | $0.49 | $0.49 |
2 rulings from Wizards of the Coast
- 24 January 2020Eidolon of Obstruction doesn’t replace the loyalty cost of activating a loyalty ability or cause it to cost more loyalty to activate. It just adds a mana component to the ability’s activation cost.
- 24 January 2020Loyalty abilities cost just {1} more to activate, no matter how much loyalty they cost to activate.