Here's a pretty sweet JUND list for you guys.
JUND Midrange
Lands:
6x Forest
4x Mountain
3x Swamp
4x Rakdos Guildgate
4x Gruul Guildgate
4x Golgari Guildgate
Creatures:
4x Liliana's Specter
2x Indulgent Tormentor
1x Stormbreath Dragon
1x Inferno Titan
4x Elvish Visionary
4x Satyr Wayfinder
4x Saruli Gatekeepers
2x Arbor Colossus
1x Soul of Zendikar
Spells:
3x Ulcerate
4x Shock
2x Anger of the Gods
4x Auger Spree
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Midrange R/G/B deck
Pros:
- Decent manabase capable of casting all of the powerful cards constantly (but read the cons list too)
- Has a lot of removal
- Has efficient creatures
- Curves out well
- Maintains a lot of card advantage with draw and two for ones
Cons:
- Can lose to tokens without Anger of the Gods
- Has a hard time dealing with large creatures like Souls & Baneslayer
- Loses to having too many tap lands in starting hand sometimes
- Mulligans really hurt your ability to recover against faster aggro decks
Half your lands are Guildgates ? Isn't that a bit too much delay-wise ?
Most hands have a single untapped land and 1 or 2 guildgates (giving you every color). You do lose a bit of tempo, but there are a lot of cheap cards and you can reliably cast Shocks/Ulcerate or chump block a dude until you get to more mana and drop the good stuff. Also, most of the chump blockers can trade one-for-one and Lilana's Specter can trade up and kind of 2-1 (1 card from their hand + 1 creature) so you're not really that far behind once you've stabilized and it's not hard to win with access to the best creatures in those colors. I'd say try it.
edit: forgot to say you get at least 2 - 3 cards with a single Anger of the Gods so yeah. idk. I think control has a really good place in this meta (at least at the moment) so running 3 color decks isn't a bad idea as long as you're playing the best cards available in those colors. Like I wouldn't be splashing White for Planar Cleansing, but if you're U/W then why not dip into Red for access to Anger of the Gods and Shocks?