Contagion 
Instant
$0.27 #12823 0.20 30.4 years
You may pay 1 life and exile a black card from your hand rather than pay this spell's mana cost.
Distribute two -2/-1 counters among one or two target creatures.
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Splendid Agony84%
$0.20↓#15437↓0.119.5 years↓
"Distribute two -1/-1 counters among one or two target creatures."
Sickening Shoal84%
$8.98↑#19615↓0.1221.7 years↓
"You may exile a black card with mana value X from your hand rather than pay this spell's mana cost."
+1 more matching line
Force of Despair80%
$6.37↑#2454↑0.77↑7.4 years↓
"If it's not your turn, you may exile a black card from your hand rather than pay this spell's mana cost."
Sick and Tired80%
$0.08↓#31340↓0.06↓27.7 years↓
"Two target creatures each get -1/-1 until end of turn."
Unmask79%
$6.25↑#18070↓0.52↑27.0 years↓
"You may exile a black card from your hand rather than pay this spell's mana cost."
Soul Spike78%
$17.57↑#25844↓0.06↓20.2 years↓
"You may exile two black cards from your hand rather than pay this spell's mana cost."
Demon of Death's Gate78%
$2.90↑#137270.2216.3 years↓
"You may pay 6 life and sacrifice three black creatures rather than pay this spell's mana cost."
Grind // Dust74%
$0.16↓#26674↓0.31↑9.3 years↓
"Put a -1/-1 counter on each of up to two target creatures."
Force of Will73%
$55.32↑#204↑2.15↑30.4 years
"You may pay 1 life and exile a blue card from your hand rather than pay this spell's mana cost."
Pyrokinesis72%
$1.78↑#5275↑0.32↑30.4 years
"You may exile a red card from your hand rather than pay this spell's mana cost."
+1 more matching line
Incremental Blight72%
$0.18↓#6175↑0.09↓18.5 years↓
"Put a -1/-1 counter on target creature, two -1/-1 counters on another target creature, and three -1/-1 counters on a third target creature."
Ruthless Disposal72%
$0.16↓#25655↓0.00↓10.2 years↓
"Two target creatures each get -13/-13 until end of turn."
Grief71%
$2.19↑#6476↑0.79↑5.5 years↓
"Evoke—Exile a black card from your hand."
Scars of the Veteran71%
$0.28↑#27211↓0.10↓30.4 years
"You may exile a white card from your hand rather than pay this spell's mana cost."
Greater Werewolf70%
$0.16↓#30619↓0.04↓31.1 years
"At end of combat, put a -0/-2 counter on each creature blocking or blocked by this creature."
Scar70%
$0.23↓#19802↓0.1918.5 years↓
"Put a -1/-1 counter on target creature."
Nefashu70%
$0.29↑#20922↓0.2223.4 years↓
"Whenever this creature attacks, up to five target creatures each get -1/-1 until end of turn."
Retribution70%
$0.19↓#28808↓0.05↓31.1 years
"Choose two target creatures controlled by the same opponent. That player chooses and sacrifices one of those creatures. Put a -1/-1 counter on the other."