Modern Twelvepost deck
Twelvepost is a deck for the Modern format that originated out of Tooth and Nail decks that first appeared in Mirrodin block Constructed and made their ways through all formats up to Extended. However, the namesake card, Tooth and Nail of these predecessors is generally gone and replaced by Green Sun's Zenith or Summoner's Pact. Some versions also use red for Through the Breach
The deck aims at putting a number of lands into play that can generate a large amount of colorless mana. This is either accomplished by putting together a number of "Posts" with the type Locus. Primarily this is Cloudpost (which is now banned in Modern), powered up by Glimmerpost and/or copied by Vesuva. Alternatively the Urzatron, consisting of Urza's Tower, Urza's Mine and Urza's Power Plant can be used. Primeval Titan is the primary option to assemble the lands, and can also work as an alternate win condition.
Using all the mana, a big creature is cast to end the game, usually an Eldrazi such as Emrakul, the Aeon's Torn or Ulamog, the Infinite Gyre. The eldrazi can also be searched up with Eye of Ugin, another land that can easily be found.