Cheapest priced copy (Gatecrash): $0.35 at Card Kingdom, near mint, their price list as of .
Guardian of the Gateless 
Creature — Angel · 3/3 · Uncommon · Gatecrash · #14
Flying
This creature can block any number of creatures.
Whenever this creature blocks, it gets +1/+1 until end of turn for each creature it's blocking.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.35 to $10.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Conspiracy: Take the Crown | 89 | Uncommon | $0.39 | $10.99 |
| Gatecrash | 14 | Uncommon | $0.35 | $2.99 |
One ruling from Wizards of the Coast
- 24 January 2013Guardian of the Gateless's last ability triggers only once when it's declared as a blocker no matter how many creatures it's blocking.