Snake Pit 
Enchantment
$0.32 #13956 0.06 26.9 years
Whenever an opponent casts a blue or black spell, you may create a 1/1 green Snake creature token.
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Cards similar to Snake Pit expected a card that isn't here?
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Eyes of the Wisent95%
$0.59↑#22472↓0.25↑18.9 years↓
"Whenever an opponent casts a blue spell during your turn, you may create a 4/4 green Elemental creature token."
Witchstalker90%
$0.25↓#19122↓0.27↑13.1 years↓
"Whenever an opponent casts a blue or black spell during your turn, put a +1/+1 counter on this creature."
Mold Adder90%
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"Whenever an opponent casts a blue or black spell, you may put a +1/+1 counter on this creature."
Dragonlair Spider86%
$0.47↑#8231↑0.1014.3 years↓
"Whenever an opponent casts a spell, create a 1/1 green Insect creature token."
Freyalise's Charm84%
$0.19↓#29607↓0.0031.3 years↑
"Whenever an opponent casts a black spell, you may pay . If you do, you draw a card."
. If you do, you draw a card."
Demon's Horn80%
$0.23↓#6483↑0.0022.6 years↓
"Whenever a player casts a black spell, you may gain 1 life."
Kraken's Eye80%
$0.10↓#156090.25↑22.6 years↓
"Whenever a player casts a blue spell, you may gain 1 life."
Sol'kanar the Swamp King80%
$0.16↓#19706↓0.1232.3 years↑
"Whenever a player casts a black spell, you gain 1 life."
Crystal Rod80%
$0.12↓#26717↓0.0033.1 years↑
"Whenever a player casts a blue spell, you may pay 
. If you do, you gain 1 life."
. If you do, you gain 1 life."
Throne of Bone78%
$0.17↓#24397↓0.75↑33.1 years↑
"Whenever a player casts a black spell, you may pay . If you do, you gain 1 life."
. If you do, you gain 1 life."
Great Sable Stag75%
$0.33↑#23731↓0.56↑17.1 years↓
"Protection from blue and from black"
Karplusan Strider75%
$0.07↓#30746↓0.0020.1 years↓
"This creature can't be the target of blue or black spells."
Howling Moon74%
$1.80↑#5659↑0.004.8 years↓
"Whenever an opponent casts their second spell each turn, create a 2/2 green Wolf creature token."
Infested Roothold74%
$0.26↓#22994↓0.0022.6 years↓
"Whenever an opponent casts an artifact spell, you may create a 1/1 green Insect creature token."
March of the World Ooze73%
$1.87↑#4299↑0.31↑1.6 years↓
"Whenever an opponent casts a spell, if it's not their turn, you create a 3/3 green Elephant creature token."
Bog Gnarr72%
$0.08↓#31756↓0.0025.3 years↓
"Whenever a player casts a black spell, this creature gets +2/+2 until end of turn."
Amphibious Kavu72%
$0.08↓#29522↓0.29↑25.6 years↓
"Whenever this creature blocks or becomes blocked by one or more blue and/or black creatures, this creature gets +3/+3 until end of turn."
Oversoul of Dusk72%
$1.45↑#24448↓0.24↑18.3 years↓
"Protection from blue, from black, and from red"
Radiant Essence72%
$0.21↓#31973↓0.28↑29.9 years↑
"This creature gets +1/+2 as long as an opponent controls a black permanent."
Glade Gnarr71%
$0.05↓#31511↓0.53↑25.3 years↓
"Whenever a player casts a blue spell, this creature gets +2/+2 until end of turn."