Cheapest priced copy (Onslaught): $0.35 at Card Kingdom, near mint, their price list as of .
Battlefield Medic 
Creature — Human Cleric · 1/1 · Common · Onslaught · #9
{T}: Prevent the next X damage that would be dealt to target creature this turn, where X is the number of Clerics on the battlefield.
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
1 printing · $0.35 to $1.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Onslaught | 9 | Common | $0.35 | $1.49 |
One ruling from Wizards of the Coast
- 4 October 2004The value of X is determined when this resolves, not later when damage would be dealt.