In response to a new player who recently posted below a request for 4 decks built at the same time from 3 Core Sets, I tackled this subject near the beginning of the 2E hobby forum and gave 4 deck lists then. To help future new players find this post, I thought it best to start a new thread with clear topic contents.
Below are 4 sample decks built from 3 Core sets at the same time. They are not optimal as I have had to share out a few popular cards. But they do illustrate 4 very different archetypes that new players can then improve on (like pre-constructed decks used as starting points in Magic).
1x A Noble Cause
1x Counting Coppers
1x Marched to the Wall
2x Sneak Attack
1x Summons
1x The Winds of Winter
1x Littlefinger
3x Rattleshirt's Raiders
3x Arya Stark
3x Bran Stark
3x Catelyn Stark
3x Eddard Stark
3x Grey Wind
3x Robb Stark
3x Sansa Stark
1x Summer
3x Direwolf Pup
3x Tumblestone Knight
3x Winterfell Steward
3x The Kingsroad
3x The Roseroad
2x Gates of Winterfell
3x Heart Tree Grove
2x Little Bird
3x Ice
Events (9)
3x Put to the Sword
3x For the North!
3x Winter Is Coming
1x Building Orders
1x Calling the Banners
1x Confiscation
2x Filthy Accusations
1x Summons
1x Wildfire Assault
1x Littlefinger
1x Maester Cressen
3x Melisandre
3x Robert Baratheon
3x Selyse Baratheon
3x Ser Davos Seaworth
1x Shireen Baratheon
3x Stannis Baratheon
3x Bastard in Hiding
3x Fiery Followers
3x Dragonstone Faithful
3x Vanguard Lancer
2x The Iron Throne
3x The Kingsroad
3x The Roseroad
3x Dragonstone Port
2x Chamber of the Painted Table
3x The Red Keep
1x Seal of the Hand
3x Milk of the Poppy
1x Lightbringer
Events (9)
3x Consolidation of Power
3x Ours is the Fury
3x Seen In Flames
1x A Noble Cause
1x Calling the Banners
1x Confiscation
1x Marched to the Wall
2x Summons
1x The Winds of Winter
2x Littlefinger
3x Daenerys Targaryen
3x Drogon
3x Khal Drogo
3x Magister Illyrio
3x Rhaegal
3x Ser Jorah Mormont
3x Viserion
2x Viserys Targaryen
3x Braided Warrior
3x Handmaiden
3x Targaryen Loyalist
3x Unsullied
3x The Kingsroad
3x The Roseroad
3x Plaza of Punishment
3x Illyrio's Estate
3x The Hand's Judgement
3x Dracarys!
3x Fire and Blood
2x Waking the Dragon
1x A Game of Thrones
1x A Noble Cause
1x Calling the Banners
1x Calm Over Westeros
1x Confiscation
2x Counting Coppers
2x Littlefinger
3x Varys
1x Grand Maester Pycelle
3x Ser Jaime Lannister
1x The Tickler
3x Tyrion Lannister
3x Tywin Lannister
3x Lannisport Merchant
3x Margaery Tyrell
3x The Knight of Flowers
3x Olenna's Informant
3x Garden Caretaker
3x The Kingsroad
3x The Roseroad
3x Western Fiefdom
1x Seal of the Hand
3x Bodyguard
3x Milk of the Poppy
1x Widow's Wail
3x Tears of Lys
All of these decks are joust, to be played against each other. None of them have been built for melee.