Mercadia's Downfall 

Instant
$0.27 #15643 0.07 26.9 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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Pack Attack78%
$0.17↓#182860.26↑4.2 years↓
"Attacking creatures get +X/+0 until end of turn, where X is the number of players being attacked."
Rally the Forces76%
$0.05↓#25203↓0.27↑15.6 years↓
"Attacking creatures get +1/+0 and gain first strike until end of turn."
Volcanic Rush75%
$0.03↓#24136↓0.0711.4 years↓
"Attacking creatures get +2/+0 and gain trample until end of turn."
Skyshroud Elite73%
$0.15↓#27257↓0.0628.2 years↑
"This creature gets +1/+2 as long as an opponent controls a nonbasic land."
Stampede71%
$0.49↑#22674↓0.33↑31.3 years↑
"Attacking creatures get +1/+0 and gain trample until end of turn."