Cheapest priced copy (Mystery Booster 2): $8.99 at Card Kingdom, near mint, their price list as of .
Cathars' Crusade 
Enchantment · Rare · Avacyn Restored · #10
Whenever a creature you control enters, put a +1/+1 counter on each creature you control.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
9 printings · $8.99 to $20.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Avacyn Restored | 10 | Rare | $11.99 | $15.99 |
| Commander 2014 | 67 | Rare | $9.99 | — |
| Commander 2016 | 61 | Rare | $10.99 | — |
| Commander Anthology Volume II | 20 | Rare | $11.99 | — |
| Innistrad Remastered | 17 | Rare | $9.99 | $11.99 |
| Innistrad Remastered | 337 | Rare | $10.99 | $9.99 |
| Innistrad Remastered | 483 | Rare | $20.99 | $17.99 |
| Jumpstart | 95 | Rare | $11.99 | — |
| Mystery Booster 2 | 6 | Rare | $8.99 | — |
One ruling from Wizards of the Coast
- 1 May 2012The creature that entered and caused the ability to trigger will also get a +1/+1 counter, provided it's still on the battlefield when the ability resolves.