Pucatrade is not a pyramid scheme.
Sure, referrals give you points which increases the money supply in the puca system.
The primary purpose of pucatrade is to allow for an intermediate store of value, pucapoints, when doing trades online. There is no advantage to being someone who is at the top of a recruitment "pyramid" or recruited a bunch of people who pay or complete trades. Sure, if you recruit a bunch of people, you get rewarded for bringing in new traders, but you don't get a cut of their potential recruitment rewards.
http://magiccards.info/query?q=cmc%3C4+c%3Aum+%28c%3Ag+or+c%3Ar%29+t%3Ainstant+-r%3Arare+-f%3Amodern&v=card&s=cname
Edit: going to go ahead and guess you most likely got the instant/sorcery part wrong.
Is it green? (which should be helpful anyways)
Squee's Revenge
Mox Pearl
Scorched Earth
Player Scores
84 Tomsloger
46 Feyd_Ruin
30 CTNC
22 canadiangreenberet
17 Kahedron
16 Pikachu_gundam
14 pokerbob1
13 Necarg
09 reddevils77
07 deritof
08 Unatco
01 Callahan09
It is monocolored.
It is a creature.
Its converted mana cost is less than 4.
It does not have printed power greater than 1.
It is not a soldier, goblin, human, merfolk, zombie, beast, or elf.
It is not white or blue.
It is not red.
It is not standard legal.
It is not a vampire, insect, spirit, elemental, horror, or frog.
Its printed toughness is not greater than its printed power.
It is green.
Its converted mana cost is 2.
Its English name does start with a letter A-M.
It is not a sliver.
It has not been printed as an uncommon.
Splendid Genesis
DARKSTEEL COLOSSSUS
Colossus of Sardia
Arbor Colossus
Colossodon Yearling
Cerodon Yearling
Serra Avenger
Goblin Guide
Jace, Vyrn's Prodigy
Kederekt Parasite
Treefolk Harbinger
Dryad Arbor
Predator Ooze
Rock Hydra
Aquastrand Spider
Blight Mamba
It is monocolored.
It is a creature.
Its converted mana cost is less than 4.
It does not have printed power greater than 1.
It is not a soldier, goblin, human, merfolk, zombie, beast, or elf.
It is not white or blue.
It is not red.
It is not standard legal.
It is not a vampire, insect, spirit, elemental, horror, or frog.
Its printed toughness is not greater than its printed power.
It is green.
Its converted mana cost is 2.
Its English name does start with a letter A-M.
Splendid Genesis
DARKSTEEL COLOSSSUS
Colossus of Sardia
Arbor Colossus
Colossodon Yearling
Cerodon Yearling
Serra Avenger
Goblin Guide
Jace, Vyrn's Prodigy
Kederekt Parasite
Treefolk Harbinger
Dryad Arbor
Predator Ooze
Rock Hydra
6 guesses remain.
It is monocolored.
It is a creature.
Its converted mana cost is less than 4.
It does not have printed power greater than 1.
It is not a soldier, goblin, human, merfolk, zombie, beast, or elf.
It is not white or blue.
It is not red.
It is not standard legal.
It is not a vampire, insect, spirit, elemental, horror, or frog.
Its printed toughness is not greater than its printed power.
Splendid Genesis
DARKSTEEL COLOSSSUS
Colossus of Sardia
Arbor Colossus
Colossodon Yearling
Cerodon Yearling
Serra Avenger
Goblin Guide
Jace, Vyrn's Prodigy
Kederekt Parasite
Treefolk Harbinger
It is modern legal.
It is monocolored.
It is a creature.
Its converted mana cost is less than 4.
It does not have printed power greater than 1.
It is not a soldier, goblin, human, merfolk, zombie, beast, or elf.
It is not white or blue.
It is not red.
It is not standard legal.
Splendid Genesis
DARKSTEEL COLOSSSUS
Colossus of Sardia
Arbor Colossus
Colossodon Yearling
Cerodon Yearling
Serra Avenger
Goblin Guide
Jace, Vyrn's Prodigy
It is monocolored.
It is a creature.
Its converted mana cost is less than 4.
Splendid Genesis
DARKSTEEL COLOSSSUS
Colossus of Sardia
Arbor Colossus
It is monocolored.
It is a creature.
Splendid Genesis
DARKSTEEL COLOSSSUS
Colossus of Sardia
It is monocolored.
Splendid Genesis
DARKSTEEL COLOSSSUS
Splendid Genesis
That's also my guess.
Also, magiccards.info thinks her CMC is 1.
Lowland Tracker