Cheapest priced copy (The List): $0.59 at Card Kingdom, near mint, their price list as of .
Mercadia's Downfall 
Instant · Uncommon · Mercadian Masques · #205
Each attacking creature gets +1/+0 until end of turn for each nonbasic land defending player controls.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $0.59 to $19.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Mercadian Masques | 205 | Uncommon | $0.99 | $19.99 |
| The List | MMQ-205 | Uncommon | $0.59 | — |
One ruling from Wizards of the Coast
- 4 October 2004The creatures that are attacking is determined when this resolves and is not changed later, even if you have another combat phase.