Primeval Force {2}{G}{G}{G}
Creature — Elemental
When this creature enters, sacrifice it unless you sacrifice three Forests.
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Cards that do something similar expected a card that isn't here?
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Plant Elemental 96%
$0.22#31085
"When this creature enters, sacrifice it unless you sacrifice a Forest."
Rogue Elephant 96%
$0.18#29589
"When this creature enters, sacrifice it unless you sacrifice a Forest."
War Elemental 82%
$4.58#12993
"When this creature enters, sacrifice it unless an opponent was dealt damage this turn."
Phyrexian Dreadnought 82%
$277.53#9664
"When this creature enters, sacrifice it unless you sacrifice any number of creatures with total power 12 or greater."
Bull Elephant 81%
$0.20#29841
"When this creature enters, sacrifice it unless you return two Forests you control to their owner's hand."
Balduvian Horde 81%
$0.05#28476
"When this creature enters, sacrifice it unless you discard a card at random."
Minotaur Explorer 81%
$0.27#29926
"When this creature enters, sacrifice it unless you discard a card at random."