Worthy Cause 
Instant
$0.38 #22196 0.05 28.9 years
Buyback 
(You may pay an additional as you cast this spell. If you do, put this card into your hand as it resolves.)
(You may pay an additional as you cast this spell. If you do, put this card into your hand as it resolves.)As an additional cost to cast this spell, sacrifice a creature.
You gain life equal to the sacrificed creature's toughness.
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"
, Sacrifice a creature: You gain life equal to the sacrificed creature's toughness."
, Sacrifice a creature: You gain life equal to the sacrificed creature's toughness."
Miren, the Moaning Well86%
$21.96↑#8198↑0.22↑21.3 years↓
"
, 
, Sacrifice a creature: You gain life equal to the sacrificed creature's toughness."
, , Sacrifice a creature: You gain life equal to the sacrificed creature's toughness."
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"Enchanted land has ", Sacrifice a creature: You gain life equal to the sacrificed creature's toughness.""
, Sacrifice a creature: You gain life equal to the sacrificed creature's toughness.""
Kheru Dreadmaw84%
$0.06↓#259690.0711.9 years↓
"
, Sacrifice another creature: You gain life equal to the sacrificed creature's toughness."
, Sacrifice another creature: You gain life equal to the sacrificed creature's toughness."
Momentous Fall82%
$3.47↑#2572↑0.28↑16.4 years↓
"You draw cards equal to the sacrificed creature's power, then you gain life equal to its toughness."
+1 more matching line
Devour Flesh82%
$0.12↓#204160.25↑13.6 years↓
"Target player sacrifices a creature of their choice, then gains life equal to that creature's toughness."
Demon of Catastrophes81%
$0.31↓#15129↑0.20↑8.1 years↓
"As an additional cost to cast this spell, sacrifice a creature."
Diamond Valley80%
$693.33↑#17341↑0.49↑32.7 years↑
", Sacrifice a creature: You gain life equal to the sacrificed creature's toughness."
, Sacrifice a creature: You gain life equal to the sacrificed creature's toughness."
Mystic Speculation80%
$1.03↑#7752↑0.87↑19.3 years↓
"Buyback You may pay an additional as you cast this spell. If you do, put this card into your hand as it resolves."
You may pay an additional as you cast this spell. If you do, put this card into your hand as it resolves."
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", Sacrifice another creature: You gain life equal to the sacrificed creature's toughness."
, Sacrifice another creature: You gain life equal to the sacrificed creature's toughness."
Bushmeat Poacher80%
$0.07↓#15595↑0.126.4 years↓
", , Sacrifice another creature: You gain life equal to the sacrificed creature's toughness. Draw a card."
, , Sacrifice another creature: You gain life equal to the sacrificed creature's toughness. Draw a card."
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$0.03↓#5966↑0.55↑17.9 years↓
"As an additional cost to cast this spell, sacrifice a creature."
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"Buyback You may pay an additional as you cast this spell. If you do, put this card into your hand as it resolves."
You may pay an additional as you cast this spell. If you do, put this card into your hand as it resolves."
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"Buyback You may pay an additional as you cast this spell. If you do, put this card into your hand as it resolves."
You may pay an additional as you cast this spell. If you do, put this card into your hand as it resolves."
Allay79%
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"Buyback You may pay an additional as you cast this spell. If you do, put this card into your hand as it resolves."
You may pay an additional as you cast this spell. If you do, put this card into your hand as it resolves."
Lab Rats78%
$0.53↑#12891↑0.1428.5 years
"Buyback 
You may pay an additional as you cast this spell. If you do, put this card into your hand as it resolves."
You may pay an additional as you cast this spell. If you do, put this card into your hand as it resolves."