Cheapest priced copy (Edge of Eternities): $0.49 at Card Kingdom, near mint, their price list as of .
Emissary Escort 
Artifact Creature — Robot Soldier · 0/4 · Rare · Edge of Eternities Promos · #56p
This creature gets +X/+0, where X is the greatest mana value among other artifacts you control.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
5 printings · $0.49 to $0.59 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Edge of Eternities | 56 | Rare | $0.49 | $0.49 |
| Edge of Eternities | 326 | Rare | $0.59 | $0.49 |
| Edge of Eternities | 399 | Rare | — | $0.49 |
| Edge of Eternities Promos | 56p | Rare | $0.49 | $0.49 |
| Edge of Eternities Promos | 56s | Rare | — | $0.59 |
2 rulings from Wizards of the Coast
- 25 July 2025If a permanent has {X} in its mana cost, X is 0 for the purpose of determining its mana value.
- 25 July 2025Emissary Escort’s ability applies only while it is on the battlefield. In all other zones, its power is 0.