Dredge

By Strong Sad (Todd Anderson, mtgo)

Lands (17)

1  Bayou

4  Marsh Flats

8  Swamp

4  Verdant Catacombs

Creatures (15)

1  Elesh Norn, Grand Cenobite

4  Griselbrand

1  Iona, Shield of Emeria

3  Necrotic Ooze

1  Phyrexian Devourer

4  Putrid Imp

1  Triskelion

Artifacts (4)

4  Lotus Petal

Instants (8)

4  Dark Ritual

4  Entomb

Sorceries (16)

3  Buried Alive

1  Crippling Fatigue

4  Exhume

4  Reanimate

4  Thoughtseize

Sideboard

4  Abrupt Decay

1  Angel of Despair

1  Crippling Fatigue

3  Duress

2  Engineered Plague

3  Pithing Needle

1  Terastodon

Grixis Delver (Wizards)

by MakingSmartPlays (mtgo)

Lands (18)

4  Flooded Strand

1  Misty Rainforest

3  Scalding Tarn

3  Underground Sea

3  Volcanic Island

4  Wasteland

18 lands

Creatures (13)

4  Dark Confidant

4  Delver of Secrets

1  Grim Lavamancer

4  Young Pyromancer

13 creatures

Instants (21)

4  Brainstorm

4  Daze

2  Dismember

3  Force of Will

4  Lightning Bolt

4  Stifle

Sorceries (8)

4  Ponder

4  Gitaxian Probe

Sideboard

4  Cabal Therapy

1  Force of Will

1  Grim Lavamancer

2  Pyroblast

2  Red Elemental Blast

4  Relic of Progenitus

1  Umezawa's Jitte

Goblins

Creatures (33)
4 Gempalm Incinerator
4 Goblin Lackey
4 Goblin Matron
4 Goblin Piledriver
4 Goblin Ringleader
1 Goblin Sharpshooter
4 Goblin Warchief
3 Mogg War Marshal
2 Siege-Gang Commander
1 Skirk Prospector
1 Stingscourger
1 Tin Street Hooligan

Spells (4)
4 Aether Vial

Lands (23)
3 Mountain
1 Bloodstained Mire
4 Cavern of Souls
1 Plateau
4 Rishadan Port
1 Scalding Tarn
1 Taiga
4 Wasteland
4 Wooded Foothills

Sideboard
3 Relic of Progenitus
2 Angel of Despair
1 Tin Street Hooligan
2 Krosan Grip
2 Pyrokinesis
1 Red Elemental Blast
4 Thalia, Guardian of Thraben

Deathblade

The next evolution of stoneblade.  Instead of just being esper, they start incorporating green.
The deck is very vulnerable to Wasteland (especially recursive Wastelands) because of its mana base, but it gains a lot of options by branching out so far.

Definitely a strong deck, but takes a lot of practice.

Creatures (11)
4 Deathrite Shaman
2 Snapcaster Mage
4 Stoneforge Mystic
2 Vendilion Clique

Planeswalkers (4)
3 Jace, the Mind Sculptor

Artifacts (2)
1 Batterskull
1 Umezawa's Jitte

Instants (14)
2 Abrupt Decay
4 Brainstorm
3 Force of Will
1 Spell Pierce
4 Swords to Plowshares

Sorceries (7)
3 Lingering Souls
1 Ponder
3 Thoughtseize

Lands (22)
1 Island
1 Plains
1 Bayou
4 Flooded Strand
1 Misty Rainforest
4 Polluted Delta
1 Scrubland
1 Tropical Island
3 Tundra
3 Underground Sea
1 Verdant Catacombs
1 Karakas

Sideboard
1 Engineered Explosives
2 Nihil Spellbomb
1 Flusterstorm
1 Force of Will
1 Sword of Feast and Famine
3 Geist of Saint Traft
2 Inquisition of Kozilek
2 Supreme Verdict
1 Liliana of the Veil
1 Talrand, the Sky Summoner

Shardless BUG

Creatures (12)
4 Shardless Agent
4 Deathrite Shaman
4 Tarmogoyf
1 Baleful Strix

Artifacts (1)
1 Umezawa's Jitte

Planeswalkers (3)
3 Jace, the Mind Sculptor

Enchantments (1)
1 Pernicious Deed

Instants (11)
4 Abrupt Decay
4 Brainstorm
3 Force of Will

Sorceries (8)
4 Ancestral Vision
4 Hymn to Tourach

Lands (23)
2 Bayou
3 Tropical Island
3 Underground Sea
2 Creeping Tar Pit
4 Misty Rainforest
4 Polluted Delta
1 Verdant Catacombs
3 Wasteland
1 Island

Sideboard (15)
2 Thoughtseize
2 Engineered Plague
2 Nihil Spellbomb
1 Liliana of the Veil
1 Force of Will
1 Maelstrom Pulse
1 Talrand, the Sky Summoner
2 Submerge
1 Life from the Loam
1 Venser, Shaper Savant
1 Garruk Relentless