Cheapest priced copy (Magic 2013): $3.99 at Card Kingdom, near mint, their price list as of .
Slumbering Dragon 
Creature — Dragon · 3/3 · Rare · Magic 2013 · #148
Flying
This creature can't attack or block unless it has five or more +1/+1 counters on it.
Whenever a creature attacks you or a planeswalker you control, put a +1/+1 counter on this creature.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $3.99 to $10.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Magic 2013 | 148 | Rare | $3.99 | $10.99 |
3 rulings from Wizards of the Coast
- 1 July 2012The +1/+1 counter is put on Slumbering Dragon before blockers are declared. This may allow Slumbering Dragon to "wake up" and block the creature that attacked and caused its ability to trigger.
- 1 July 2012Slumbering Dragon's third ability will trigger once for each creature that attacks you or a planeswalker you control.
- 1 July 2012Slumbering Dragon's second ability counts all +1/+1 counters on it, not just the ones added by its third ability.