Mercadia's Downfall 
Instant
$0.24 #15924 0.00 27.0 years
Each attacking creature gets +1/+0 until end of turn for each nonbasic land defending player controls.
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Cards similar to Mercadia's Downfall expected a card that isn't here?
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Army of Allah84%
$23.54↑#28431↓0.20↑32.8 years↑
"Attacking creatures get +2/+0 until end of turn."
Trumpet Blast84%
$0.04↓#159780.13↑27.4 years
"Attacking creatures get +2/+0 until end of turn."
Pack Attack82%
$0.22↓#185930.12↑4.4 years↓
"Attacking creatures get +X/+0 until end of turn, where X is the number of players being attacked."
Rally the Forces76%
$0.06↓#25525↓0.0015.7 years↓
"Attacking creatures get +1/+0 and gain first strike until end of turn."
Volcanic Rush74%
$0.03↓#24401↓0.0611.6 years↓
"Attacking creatures get +2/+0 and gain trample until end of turn."
Stampede74%
$0.50↑#22981↓0.13↑31.4 years↑
"Attacking creatures get +1/+0 and gain trample until end of turn."
Skyshroud Elite74%
$0.14↓#27655↓0.0028.3 years↑
"This creature gets +1/+2 as long as an opponent controls a nonbasic land."
Morale70%
$0.14↓#30573↓0.0032.2 years↑
"Attacking creatures get +1/+1 until end of turn."
Pursue Glory70%
$0.08↓#24943↓0.009.5 years↓
"Attacking creatures get +2/+0 until end of turn."
Weight of Spires70%
$0.24#22282↓0.38↑20.5 years↓
"this card deals damage to target creature equal to the number of nonbasic lands that creature's controller controls."