Cheapest priced copy (Archenemy): $0.99 at Card Kingdom, near mint, their price list as of .
Sun Droplet 
Artifact · Uncommon · Archenemy · #117
Whenever you're dealt damage, put that many charge counters on this artifact.
At the beginning of each upkeep, you may remove a charge counter from this artifact. If you do, you gain 1 life.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
4 printings · $0.99 to $9.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Archenemy | 117 | Uncommon | $0.99 | — |
| Commander 2013 | 261 | Uncommon | $0.99 | — |
| Commander 2021 | 268 | Uncommon | $1.29 | — |
| Mirrodin | 249 | Uncommon | $1.49 | $9.99 |
One ruling from Wizards of the Coast
- 1 May 2006In Two-Headed Giant, triggers only once per upkeep, not once for each player.