Cheapest priced copy (March of the Machine): $0.35 at Card Kingdom, near mint, their price list as of .
Elvish Vatkeeper 
Creature — Phyrexian Elf · 3/3 · Uncommon · March of the Machine · #223
When this creature enters, incubate 2. (Create an Incubator token with two +1/+1 counters on it and "{2}: Transform this token." It transforms into a 0/0 Phyrexian artifact creature.)
{5}: Transform target Incubator token you control. Double the number of +1/+1 counters on it.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| March of the Machine | 223 | Uncommon | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 14 April 2023The target Incubator token transforms before its +1/+1 counters are doubled, so anything that cares about +1/+1 counters being placed on a creature will see them being placed on the Phyrexian artifact creature.