Cheapest priced copy (Starter Commander Decks): $0.69 at Card Kingdom, near mint, their price list as of .
Magmatic Force 
Creature — Elemental · 7/7 · Rare · Battlebond · #181
At the beginning of each upkeep, this creature deals 3 damage to any target.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
4 printings · $0.69 to $2.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Battlebond | 181 | Rare | $0.79 | $2.99 |
| Commander 2011 | 128 | Rare | $1.29 | — |
| The List | CMD-128 | Rare | $1.79 | — |
| Starter Commander Decks | 150 | Rare | $0.69 | — |
2 rulings from Wizards of the Coast
- 22 September 2011In a Two-Headed Giant game, this ability triggers once at the beginning of each team’s upkeep.
- 22 September 2011The controller of Magmatic Force when its ability triggers always chooses the target, even when the ability triggers during another player’s upkeep.