Primeval Force 
Creature — Elemental
$0.23 #30458 0.62 29.3 years
When this creature enters, sacrifice it unless you sacrifice three Forests.
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Cards similar to Primeval Force expected a card that isn't here?
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Plant Elemental100%
$0.22↓#314510.00↓29.3 years
"When this creature enters, sacrifice it unless you sacrifice a Forest."
Rogue Elephant100%
$0.18↓#300370.24↓29.2 years
"When this creature enters, sacrifice it unless you sacrifice a Forest."
Scythe Tiger91%
$0.13↓#267070.25↓16.9 years↓
"When this creature enters, sacrifice it unless you sacrifice a land."
Rathi Dragon84%
$0.38↑#310330.11↓28.9 years
"When this creature enters, sacrifice it unless you sacrifice two Mountains."
Foul Spirit84%
$0.61↑#316250.06↓28.2 years↓
"When this creature enters, sacrifice a land."
Jungle Basin82%
$0.58↑#5939↑0.12↓29.6 years
"When this land enters, sacrifice it unless you return an untapped Forest you control to its owner's hand."
Bull Elephant82%
$0.21↓#301840.40↓29.8 years
"When this creature enters, sacrifice it unless you return two Forests you control to their owner's hand."
Wood Elemental80%
$20.78↑#300270.35↓32.3 years↑
"As this creature enters, sacrifice any number of untapped Forests."
Rootwater Alligator80%
$0.19↓#299030.18↓28.2 years↓
"Sacrifice a Forest: Regenerate this creature."
Cosmic Larva79%
$0.36↑#19553↑0.29↓22.3 years↓
"At the beginning of your upkeep, sacrifice this creature unless you sacrifice two lands."
Dark Heart of the Wood79%
$0.13↓#24331↑0.28↓32.1 years↑
"Sacrifice a Forest: You gain 3 life."
Mold Demon78%
$17.78↑#313700.00↓32.3 years↑
"When this creature enters, sacrifice it unless you sacrifice two Swamps."
Heart of Yavimaya78%
$4.91↑#243930.05↓30.2 years
"If this land would enter, sacrifice a Forest instead. If you do, put this land onto the battlefield. If you don't, put it into its owner's graveyard."
Fungus Elemental78%
$0.64↑#308140.19↓29.2 years
", Sacrifice a Forest: Put a +2/+2 counter on this creature. Activate only if this creature entered this turn."
, Sacrifice a Forest: Put a +2/+2 counter on this creature. Activate only if this creature entered this turn."
Goblin Clearcutter78%
$0.29↑#292110.00↓23.6 years↓
"
, Sacrifice a Forest: Add three mana in any combination of 
and/or ."
, Sacrifice a Forest: Add three mana in any combination of and/or ."
Orcish Lumberjack76%
$0.98↑#2919↑0.46↓31.3 years↑
", Sacrifice a Forest: Add three mana in any combination of and/or ."
, Sacrifice a Forest: Add three mana in any combination of and/or ."
Foratog76%
$0.17↓#21906↑0.24↓29.9 years
", Sacrifice a Forest: This creature gets +2/+2 until end of turn."
, Sacrifice a Forest: This creature gets +2/+2 until end of turn."
Jokulmorder75%
$0.56↑#24085↑0.07↓20.1 years↓
"When this creature enters, sacrifice it unless you sacrifice five lands."
Lithophage75%
$0.32↑#311020.07↓26.9 years↓
"At the beginning of your upkeep, sacrifice this creature unless you sacrifice a Mountain."
Devastating Summons74%
$0.28↑#21286↑0.25↓16.4 years↓
"As an additional cost to cast this spell, sacrifice X lands."