20) Is it common? Yes
19) Is it a permanent? Yes
18) Is it modern legal? Yes
17) Is it a creature? Yes
16) Is it printed in more than one product? I assume you mean sets. Yes.
15) Is it 3 CMC or less? Yes
14) Is it a card that's been printed in the same product as non modern-legal cards? No
13) Is it multicolor? No
12) Does it share a color with Rith, the Awakener? No
11) Does it share a color with Hellhole Rats? Yes
10) Is it 1 cmc? No

Wrong Guesses
Tangle Asp
Unholy Strength
Keldon Marauders
Akroan Crusader
Predatory Sliver
Aether Adept
Llanowar Elves
Goblin Electromancer
Brindle Boar
Elvish Mystic
Quag Vampire

Is it Standard legal?

Returned Phalanx

~SE++

20) Is it common? Yes
19) Is it a permanent? Yes
18) Is it modern legal? Yes
17) Is it a creature? Yes
16) Is it printed in more than one product? I assume you mean sets. Yes.
15) Is it 3 CMC or less? Yes
14) Is it a card that's been printed in the same product as non modern-legal cards? No
13) Is it multicolor? No
12) Does it share a color with Rith, the Awakener? No
11) Does it share a color with Hellhole Rats? Yes
10) Is it 1 cmc? No
9) Is it in standard? No

Wrong Guesses
Tangle Asp
Unholy Strength
Keldon Marauders
Akroan Crusader
Predatory Sliver
Aether Adept
Llanowar Elves
Goblin Electromancer
Brindle Boar
Elvish Mystic
Quag Vampire
Returned Phalanx

Is it a zombie?

Black Cat

~SE++

[quote="storyteller"]20) Is it common? Yes
19) Is it a permanent? Yes
18) Is it modern legal? Yes
17) Is it a creature? Yes
16) Is it printed in more than one product? I assume you mean sets. Yes.
15) Is it 3 CMC or less? Yes
14) Is it a card that's been printed in the same product as non modern-legal cards? No
13) Is it multicolor? No
12) Does it share a color with Rith, the Awakener? No
11) Does it share a color with Hellhole Rats? Yes
10) Is it 1 cmc? No
9) Is it in standard? No
8) Is it a zombie? No, it does not have subtype Zombie.

Wrong Guesses
Tangle Asp
Unholy Strength
Keldon Marauders
Akroan Crusader
Predatory Sliver
Aether Adept
Llanowar Elves
Goblin Electromancer
Brindle Boar
Elvish Mystic
Quag Vampire
Returned Phalanx
Black Cat

Does it have a human subtype?
Black Knight

20) Is it common? Yes
19) Is it a permanent? Yes
18) Is it modern legal? Yes
17) Is it a creature? Yes
16) Is it printed in more than one product? I assume you mean sets. Yes.
15) Is it 3 CMC or less? Yes
14) Is it a card that's been printed in the same product as non modern-legal cards? No
13) Is it multicolor? No
12) Does it share a color with Rith, the Awakener? No
11) Does it share a color with Hellhole Rats? Yes
10) Is it 1 cmc? No
9) Is it in standard? No
8) Is it a zombie? No, it does not have subtype Zombie.
7) Does it have the human subtype? No

Wrong Guesses
Tangle Asp
Unholy Strength
Keldon Marauders
Akroan Crusader
Predatory Sliver
Aether Adept
Llanowar Elves
Goblin Electromancer
Brindle Boar
Elvish Mystic
Quag Vampire
Returned Phalanx
Black Cat
Black Knight

Does it have any form of evasion?
Liliana's Specter

20) Is it common? Yes
19) Is it a permanent? Yes
18) Is it modern legal? Yes
17) Is it a creature? Yes
16) Is it printed in more than one product? I assume you mean sets. Yes.
15) Is it 3 CMC or less? Yes
14) Is it a card that's been printed in the same product as non modern-legal cards? No
13) Is it multicolor? No
12) Does it share a color with Rith, the Awakener? No
11) Does it share a color with Hellhole Rats? Yes
10) Is it 1 cmc? No
9) Is it in standard? No
8) Is it a zombie? No, it does not have subtype Zombie.
7) Does it have the human subtype? No
6) Does it have evasion? No

Wrong Guesses
Tangle Asp
Unholy Strength
Keldon Marauders
Akroan Crusader
Predatory Sliver
Aether Adept
Llanowar Elves
Goblin Electromancer
Brindle Boar
Elvish Mystic
Quag Vampire
Returned Phalanx
Black Cat
Black Knight
Liliana's Specter

Is it 2 CMC?

Drudge Skeletons

20) Is it common? Yes
19) Is it a permanent? Yes
18) Is it modern legal? Yes
17) Is it a creature? Yes
16) Is it printed in more than one product? I assume you mean sets. Yes.
15) Is it 3 CMC or less? Yes
14) Is it a card that's been printed in the same product as non modern-legal cards? No
13) Is it multicolor? No
12) Does it share a color with Rith, the Awakener? No
11) Does it share a color with Hellhole Rats? Yes
10) Is it 1 cmc? No
9) Is it in standard? No
8) Is it a zombie? No, it does not have subtype Zombie.
7) Does it have the human subtype? No
6) Does it have evasion? No
5) Is it 2 cmc? Yes

Wrong Guesses
Tangle Asp
Unholy Strength
Keldon Marauders
Akroan Crusader
Predatory Sliver
Aether Adept
Llanowar Elves
Goblin Electromancer
Brindle Boar
Elvish Mystic
Quag Vampire
Returned Phalanx
Black Cat
Black Knight
Liliana's Specter
Drudge Skeletons

I'm trying to only take one guess a day, to let others jump in, if they want. Getting pretty close to the end...

Well, there only seems to be like... three of us who are interested.

In that case...
Does it have an Imp subtype?

Foul Imp

20) Is it common? Yes
19) Is it a permanent? Yes
18) Is it modern legal? Yes
17) Is it a creature? Yes
16) Is it printed in more than one product? I assume you mean sets. Yes.
15) Is it 3 CMC or less? Yes
14) Is it a card that's been printed in the same product as non modern-legal cards? No
13) Is it multicolor? No
12) Does it share a color with Rith, the Awakener? No
11) Does it share a color with Hellhole Rats? Yes
10) Is it 1 cmc? No
9) Is it in standard? No
8) Is it a zombie? No, it does not have subtype Zombie.
7) Does it have the human subtype? No
6) Does it have evasion? No
5) Is it 2 cmc? Yes
4) Does it have subtype Imp? No

Wrong Guesses
Tangle Asp
Unholy Strength
Keldon Marauders
Akroan Crusader
Predatory Sliver
Aether Adept
Llanowar Elves
Goblin Electromancer
Brindle Boar
Elvish Mystic
Quag Vampire
Returned Phalanx
Black Cat
Black Knight
Liliana's Specter
Drudge Skeletons
Foul Imp

Almost ready to crash and burn!

Does it have a Rat subtype (which is what I actually wanted to ask with the last question, but my mind blanked for some reason...)

Rotting Rats

20) Is it common? Yes
19) Is it a permanent? Yes
18) Is it modern legal? Yes
17) Is it a creature? Yes
16) Is it printed in more than one product? I assume you mean sets. Yes.
15) Is it 3 CMC or less? Yes
14) Is it a card that's been printed in the same product as non modern-legal cards? No
13) Is it multicolor? No
12) Does it share a color with Rith, the Awakener? No
11) Does it share a color with Hellhole Rats? Yes
10) Is it 1 cmc? No
9) Is it in standard? No
8) Is it a zombie? No, it does not have subtype Zombie.
7) Does it have the human subtype? No
6) Does it have evasion? No
5) Is it 2 cmc? Yes
4) Does it have subtype Imp? No
3) Does it have subtype Rat? No

Wrong Guesses
Tangle Asp
Unholy Strength
Keldon Marauders
Akroan Crusader
Predatory Sliver
Aether Adept
Llanowar Elves
Goblin Electromancer
Brindle Boar
Elvish Mystic
Quag Vampire
Returned Phalanx
Black Cat
Black Knight
Liliana's Specter
Drudge Skeletons
Foul Imp
Foul Rats

Your questions are all so narrow. I don't think you're going to get this at this rate...

Well...it's 2 CMC that's not a zombie/human/rat/imp
It's in modern, but not standard, and it was printed in (at least) two sets.

Unless I'm missing something big here, from what I can tell, it can only be

Blood Seeker
Duskhunter Bat
Frenzy Sliver

*I'm guessing I'm missing something here*

Does it have 2 subtypes?
Duskhunter Bat

crap.

Er. I was under the impression 2013 wasn't in standard, somehow.
Either that or I thought it was 2012.

2013 is close to not being in standard, right?