This is Patrick Chapin's 2014 World Championship Modern decklist, which I'm currently attempting to build (I've loved the idea of U/R Delver since the first time I heard of it) - I may modify it based on the local metagame, something I've yet to dip my toe into.
Comments are welcome, updates to follow.
Changelog #1 (01/19/2015): Well, had I KNOWN the new banned lists come out in January, I might have held off on trying to build this (and almost certainly would have held off on spending as much as I did >_>), but since I'm in it now, I'd better compensate for the fact that Wizards just banned Treasure Cruise (cry). Think a couple extra Snapcaster Mage, another Remand and a pair of Grim Lavamancer between the main and the side might make the build still workable, at least. Might consider changing the Thought Scours to something else too, now that Delve isn't needed for Cruising. Sigh. I would've liked to take it to ONE event, at least... :P
(( Changes: -1 Thought Scour, -1 Threads of Disloyalty [sideboard], -1 Magma Spray [sideboard]; +1 Remand, +1 Cryptic Command [sideboard], +1 Grim Lavamancer [sideboard] ))
Changelog #2 (01/21/2015): Hooray! I'm gonna get yet one more chance to play Ancestral Recall in Modern at another event tonight. Updates to follow, and I'll try and write down some notable details from each match (after having read over my previous blurbs and finding them kind of lacking in descriptive elements). I'm also going to be trying out different strategies with respect to how to play this deck tonight and I'll try and document how it all turns out.
(( Changes [as of 01/23/2015]: -4 Treasure Cruise; +1 Electrolyze, +1 Grim Lavamancer, +2 Snapcaster Mage ))
Changelog #3 (01/27/2015): Maybe for now, but almost certainly going to change this up to UWR delver before playing tonight.
(( Changes [as of later today]: -2 Thought Scour, -2 Vapor Snag, -2 Grim Lavamancer [main and sideboard], -4 Monastery Swiftspear, -4 Gitaxian Probe,-1 Cryptic Command [sideboard], -2 Blood Moon [sideboard], -1 Harvest Pyre [sideboard], -3 Island, -1 Sulfur Falls, 2 Forked Bolt [moved to sideboard], +4 Lightning Helix, +4 Path to Exile [3 main 1 sideboard], +3 Geist of Saint Traft, +1 Remand, +1 Plains, +3 Sacred Foundry, +3 Hallowed Fountain, +1 Arid Mesa, +1 Brimaz, King of Oreskos [sideboard], +1 Spell Pierce, [sideboard] ))
Changelog #4 (02/04/2015): Haven't been able to find any Brimaz, so I'm substituting a fourth Geist of Saint Traft for now.
(( Changes: -1 Brimaz, King of Oreskos [sideboard], +1 Geist of Saint Traft [sideboard] ))
Changelog #5 (21/03/2015): Updated after having missed the last couple of changes to the deck.
(( Changes: -3 Lightning Helix, -1 Path to Exile [2 moved to sideboard]], -1 Arid Mesa, -2 Sacred Foundry, -1 Hallowed Fountain -1 Plains, -1 Spell Pierce [sideboard], -1 Dispel [sideboard], -1 Forked Bolt [sideboard], 1 Geist of Saint Traft [moved to main deck], +2 Monastery Swiftspear, +4 Gitaxian Probe, +2 Vapor Snag, +1Azorius Charm, +1 Sulfur Falls, +1 Magma Spray [sideboard], +1 Goblin Rabblemaster [sideboard] ))