The latest attempt from WotC to reintroduce multicolor play has been quite successful. Almost every deck in the current Type 2 is a two-colored deck.
Fires of Yavimaya, Nether-Go and Stompy-geddon are fine examples of players bringing the best out of the Gold cards from Invasion.
However, despite all the hubbub about Gold cards and the multicolor decks, I still play mono-color decks. The closest I came to multicolor recently was R/G LD. It was pretty fast, but it lost to Fires of Yavimaya too often for comfort.
Mono color decks never give you mana color problems. Also, the deck that you build from a color are using the strongest traits from it. Here's a list of the strengths of every color.
Black: Creature removal, discard, graveyard recursion, life gaining.
Blue: Counterspells, bounce, card drawing, stall tactics.
Green: Great low casting cost creatures, pump, trample and recently, creatures that cannot be the target of spells or abilities.
Red: Burn, land destruction, global destruction, multiple creature removal.
White: Protection from colors, global destruction, creature control.
Out of these 5 colors, I play mostly Red and Black. This 2 colors are famous for Aggro-Control decks and this decks being:
Red: Ponza, Sligh.
Black: Control, Discard deck.
Both colors uses aggressive control cards to clear the board for the win. Red uses burn, land destruction and good control creatures like Flowstone Overseer to ensure victory. Black uses creature removal, drop cards and good control creatures like Thrashing Wumpus and Abyssal Spector.
These 2 decks will win most of the time because their deck mainly features on creature removal and various other board control. Most decks rely on creatures to win, and removing them is a sure ways of winning. To back this theory up, disrupting the opponent with Land Destruction, Discard will stall the opponent long enough for the win via big creature beatdown.
When building decks from these two colors, we focus on the staple additions for these decks. This is a term I use "Stapling". Below are the cardlists of staple cards for Black and Red.
Dark Ritual: Instant mana on your first turn.
Snuff Out: Dark Banishing with a twist.
Vendetta: Cheap creature control.
Unmask: Good discard.
Addle: A fine replacement for Duress.
Thrashing Wumpus: Massive creature.
Vampiric Tutor: Super card searcher.
Seal of Fire: Cheap burn
Shock: Cheap burn
Scorching Lava: Good burn.
Pillage: 2 cards rolled into one.
Earthquake: Massive creature removal.
Flowstone Overseer: Red's own Masticore.
Using these staple cards, any Magic player with sufficient deckbuilding skills can build a deck that is tourney worthy. Let's start with Black and build a Black Control deck and later a Ponza deck with the red cards.
3 Thrashing Wumpus
4 Chilling Apparition
4 Abyssal Spector
2 Snuff Out
1 Forced March
3 Vicious Hunger
4 Vampiric Tutor
4 Dark Ritual
4 Peat Bog
4 Rishadan Port
This deck is very similar to Flores Black but lacking in Yawgmoth's Will. However, despite the loss of this card, this deck is still very potent. The strength of this deck is in its good creature removal, discard and other strong disrupting qualities.
3 Flowstone Overseer
2 Two-Headed Dragon
4 Stone Rain
4 Turf Wound
4 Tectonic Break
4 Seal of Fire
3 Scorching Lava
2 Flowstone Slide
4 Fire Diamond
4 Rishadan Port
4 Crystal Vein
4 Sandstone Needle
1 Rath's Edge
This is a new kind of Ponza deck. It has card advantage, mana acceleration and good disruption qualities. It has its share of bad matchups, but is still a Tier 1 deck to me. One main worry is the high number of non-basic lands. This is neccesary because these lands provide a mana boost and early disruption. One unusual addition in this deck is Turf Wound, which serves this deck very well because it provides land disruption and card advantage at the same time.
The decks I have made above are decks that I have played, and I must say, they make pretty good decks. They can't make it into the big scene yet, though, because there are other decks out there in Type 2 that just have that extra edge.
Feel free to make these two decks and try them out. You'll see that they win *sometimes*. Do also explore other mono color decks like Blue Control, Stompy, White Weenie and White Control...they are some good....
Cheers & Peace.