Cheapest priced copy (Rivals of Ixalan): $0.49 at Card Kingdom, near mint, their price list as of .
Paladin of Atonement 
Creature — Vampire Knight · 1/1 · Rare · Rivals of Ixalan · #16
At the beginning of each upkeep, if you lost life last turn, put a +1/+1 counter on this creature.
When this creature dies, you gain life equal to its toughness.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.49 to $1.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Rivals of Ixalan Promos | 16s | Rare | — | $0.99 |
| Rivals of Ixalan | 16 | Rare | $0.49 | $1.99 |
2 rulings from Wizards of the Coast
- 19 January 2018To determine how much life you gain for the last ability, use Paladin of Atonement’s toughness as it last existed on the battlefield. If its toughness was less than 0, you won’t gain life. (You also won’t lose life.).
- 19 January 2018Paladin of Atonement’s first ability cares only whether you lost life last turn, even if Paladin of Atonement wasn’t on the battlefield when that happened. It doesn’t care how much you lost, whether you also gained life, or even whether you gained more life than you lost.