I think the mana isn't strong enough for 3 color decks, so 2-color is probably the way to go.

UG Threshold

//Creatures: 12
4 Nimble Mongoose
4 Quirion Dryad
4 Werebear

//Spells: 30
4 Force of Will
4 Brainstorm
4 Portent
4 Careful Study
4 Aether Burst
4 Counterspell
4 Arcane Denial
2 Deep Analysis

//Lands: 18
4 Yavimaya Coast
4 Terramorphic Expanse
8 Island
2 Forest

//Sideboard: 15
3 Naturalize
3 Ground Seal
3 Hydroblast
2 Remove Soul
2 Wonder
1 Genesis
1 Envelop

The spells and creatures are good, but removal is very bad in these colors so Aether Burst is there for tempo.



BR Dragon

//Creatures: 11
4 Putrid Imp
4 Worldgorger Dragon
1 Phantom Nishoba
1 Vampiric Dragon
1 Verdant Force

//Enchantments: 4
4 Dance of the Dead

//Spells: 26
4 Dark Ritual
4 Entomb
4 Cabal Therapy
4 Burning Wish
3 Distress
3 Buried Alive
2 Diabolic Tutor
1 Stitch Together
1 Zombify

//Lands: 19
1 Lake of the Dead
4 Terramorphic Expanse
4 Sulfurous Springs
2 Mountain
8 Swamp

//Sideboard: 15
1 Soul Burn
1 Lava Burst
1 Stitch Together
1 Zombify
1 Anarchy
1 Deathmark
1 Pox
1 Pyroclasm
1 Chainer's Edict
1 Mutilate
1 Sickening Dreams
1 Innocent Blood
4 Pyroblast

Red for the Wish package (to find wincon) seems better, but it may not be able to assemble the combo consistently enough. Blue has better combo consistency but a harder time winning with infinite mana.

UB PsychaDragon

//Creatures: 8
4 Psychatog
4 Worldgorger Dragon

//Enchantments: 4
4 Dance of the Dead

//Spells: 30
4 Force of Will
4 Brainstorm
4 Portent
4 Careful Study
4 Entomb
4 Cabal Therapy
4 Lim-Dul's Vault
1 Chainer's Edict
1 Deep Analysis

//Lands: 18
4 Underground River
4 Terramorphic Expanse
6 Island
4 Swamp

//Sideboard: 15
3 Chainer's Edict
3 Memory Lapse
3 Boomerang
2 Hydroblast
2 Deathmark
1 Verdant Force
1 Petradon



UW Landstill

//Lands: 26
1 Thawing Glaciers
1 Kjeldoran Outpost
4 Faerie Conclave
4 Terramorphic Expanse
4 Adarkar Wastes
7 Snow-Covered Island
5 Snow-Covered Plains

//Enchantments: 6
4 Standstill
1 Story Circle
1 Mobilization

//Spells: 28
4 Force of Will
4 Brainstorm
4 Swords to Plowshares
4 Counterspell
3 Memory Lapse
3 Cunning Wish
4 Wrath of God
2 Deep Analysis

//Sideboard: 15
2 Disenchant
2 Hydroblast
1 Flashfreeze
1 Divert
1 Prismatic Strands
1 Evacuation
1 Winter's Chill
1 Condemn
1 Plagiarize
1 Tempest of Light
1 Time Stop
1 Beacon of Immortality
1 Flash of Insight