Cheapest priced copy (Oath of the Gatewatch): $0.35 at Card Kingdom, near mint, their price list as of .
Wall of Resurgence 
Creature — Wall · 0/6 · Uncommon · Oath of the Gatewatch · #39
Defender
When this creature enters, you may put three +1/+1 counters on target land you control. If you do, that land becomes a 0/0 Elemental creature with haste that's still a land.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Oath of the Gatewatch | 39 | Uncommon | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 22 January 2016If you target a land that’s already a creature with Wall of Resurgence’s triggered ability, that land creature’s base power and toughness will become 0/0, overwriting its previous base power and toughness. Other effects that modify its power and/or toughness (including the new and any previously-existing +1/+1 counters) will continue to apply.