Worthy Cause 
Instant
$0.40 #22416 0.17 29.0 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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"You gain life equal to the sacrificed creature's toughness. Destroy target creature an opponent controls."
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"Sacrifice a creature: You gain life equal to the sacrificed creature's toughness. Activate only during your upkeep."
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"As an additional cost to cast this spell, sacrifice a creature."
Doomgape84%
$0.21↓#196140.06↓18.2 years↓
"At the beginning of your upkeep, sacrifice a creature. You gain life equal to that creature's toughness."
Momentous Fall84%
$3.72↑#2596↑0.2216.5 years↓
"You draw cards equal to the sacrificed creature's power, then you gain life equal to its toughness."
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Flourishing Hunter84%
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$0.20↓#17382↑0.06↓7.4 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."
Tendrils of Despair84%
$0.15↓#27051↓0.67↑29.4 years
"As an additional cost to cast this spell, sacrifice a creature."
Disciple of Griselbrand84%
$0.17↓#12351↑0.44↑15.1 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."
Miren, the Moaning Well84%
$22.56↑#8168↑0.0921.4 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 Speculation84%
$1.00↑#7376↑0.0919.5 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."
Allay84%
$0.17↓#218050.1728.3 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."
Shattering Pulse84%
$0.29↓#190430.43↑28.3 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."
Lab Rats84%
$0.35↓#12853↑0.28↑28.6 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."
Village Rites84%
$0.33↓#202↑0.096.3 years↓
"As an additional cost to cast this spell, sacrifice a creature."
+1 more matching line
Corrupted Conviction84%
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"As an additional cost to cast this spell, sacrifice a creature."
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"As an additional cost to cast this spell, sacrifice a creature."
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$0.16↓#192090.00↓23.4 years↓
"As an additional cost to cast this spell, sacrifice a creature."
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Launch Party83%
$0.14↓#264450.05↓14.0 years↓
"As an additional cost to cast this spell, sacrifice a creature."