Cheapest priced copy (Planechase Anthology): $0.49 at Card Kingdom, near mint, their price list as of .
Preyseizer Dragon 
Creature — Dragon · 4/4 · Rare · Planechase 2012 · #50
Flying
Devour 2 (As this creature enters, you may sacrifice any number of creatures. It enters with twice that many +1/+1 counters on it.)
Whenever this creature attacks, it deals damage to any target equal to the number of +1/+1 counters on this creature.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
3 printings · $0.49 to $0.59 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Planechase 2012 | 50 | Rare | $0.59 | — |
| Planechase Anthology | 50 | Rare | $0.49 | — |
| The List | PCA-50 | Rare | $0.49 | — |
One ruling from Wizards of the Coast
- 1 June 2012Preyseizer Dragon's ability counts the number of +1/+1 counters on it when the ability resolves. It counts any +1/+1 counters, not just ones put on it due to devour.