Cheapest priced copy (Return to Ravnica): $0.49 at Card Kingdom, near mint, their price list as of .
Cryptborn Horror 
Creature — Horror · 0/0 · Rare · Return to Ravnica · #212
Trample
This creature enters with X +1/+1 counters on it, where X is the total life lost by your opponents this turn.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.49 to $2.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Return to Ravnica Promos | 212 | Rare | — | $2.79 |
| Return to Ravnica | 212 | Rare | $0.49 | $0.49 |
4 rulings from Wizards of the Coast
- 1 October 2012If no opponent has lost life on the turn Cryptborn Horror enters, it will enter with no +1/+1 counters on it and be put into its owner's graveyard (unless something else is raising its toughness).
- 1 October 2012Remember, damage dealt to a player causes that player to lose that much life (unless the source has infect).
- 1 October 2012In multiplayer games, life lost the turn Cryptborn Horror enters by opponents who left the game later that turn will count toward the value of X.
- 1 October 2012Cryptborn Horror cares about the total life lost, not necessarily what an opponent's life total is compared to what it was at the beginning of the turn. For example, if an opponent loses 5 life and then gains 10 life on the turn Cryptborn Horror enters, it will enter with five +1/+1 counters on it.