Rottenmouth Viper 
Creature — Elemental Snake
$5.87 #2904 0.73 2.1 years
As an additional cost to cast this spell, you may sacrifice any number of nonland permanents. This spell costs 
less to cast for each permanent sacrificed this way.
less to cast for each permanent sacrificed this way.Whenever this creature enters or attacks, put a blight counter on it. Then for each blight counter on it, each opponent loses 4 life unless that player sacrifices a nonland permanent of their choice or discards a card.
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"As an additional cost to cast this spell, sacrifice a nonland permanent."
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"Repeat the following process X times. Each opponent loses 3 life unless that player sacrifices a nonland permanent of their choice or discards a card."
Torment of Venom78%
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"Put three -1/-1 counters on target creature. Its controller loses 3 life unless they sacrifice another nonland permanent of their choice or discard a card."
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"+3: Each opponent loses 3 life unless that player sacrifices a nonland permanent of their choice or discards a card."
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"When this creature enters, target opponent loses 3 life unless they sacrifice a nonland permanent of their choice or discard a card."
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"As an additional cost to cast this spell, you may sacrifice any number of creatures. This spell costs 
less to cast for each creature sacrificed this way."
less to cast for each creature sacrificed this way."+1 more matching line
Starseer Mentor74%
$0.25↓#10854↓0.20↓2.1 years
"At the beginning of your end step, if you gained or lost life this turn, target opponent loses 3 life unless they sacrifice a nonland permanent of their choice or discard a card."
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"At the beginning of enchanted player's upkeep, that player loses 3 life unless they sacrifice a nonland permanent of their choice or discard a card."
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"As an additional cost to cast this spell, you may sacrifice any number of creatures. This spell costs less to cast for each creature sacrificed this way."
less to cast for each creature sacrificed this way."
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"This spell costs 
less to cast if there are ten or more nonland permanents on the battlefield."
less to cast if there are ten or more nonland permanents on the battlefield."
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"As an additional cost to cast this spell, sacrifice X creatures."