Cheapest priced copy (Conflux): $0.35 at Card Kingdom, near mint, their price list as of .
Manaforce Mace 
Artifact — Equipment · Uncommon · Conflux · #139
Domain — Equipped creature gets +1/+1 for each basic land type among lands you control.
Equip {3}
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Conflux | 139 | Uncommon | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 18 June 2021Domain abilities count the number of basic land types among lands you control, not how many lands you control or how many of any type.
- 18 June 2021The basic land types are Plains, Island, Swamp, Mountain, and Forest. Land types other than basic land types (such as Desert) don't contribute to domain abilities.