Cheapest priced copy (Return to Ravnica): $0.35 at Card Kingdom, near mint, their price list as of .
Chronic Flooding 
Enchantment — Aura · Common · Return to Ravnica · #32
Enchant land
Whenever enchanted land becomes tapped, its controller mills three cards.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Return to Ravnica | 32 | Common | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 1 October 2012Chronic Flooding becoming attached to a tapped land won’t cause its ability to immediately trigger. That land must go from untapped to tapped.
- 1 October 2012Chronic Flooding’s ability will trigger whenever the enchanted land becomes tapped for any reason, not just because its controller taps it for mana.