Here's my 3-sphere Dwarf Deck that I'm using for the One Deck to rule them all Summer League.
Dain Ironfoot/Bifur/ Gimli
Neutral cards
3x Gandalf
1x Boot from Erebor
Spirit Cards
3x A Burning Brand
3x Forest Snare
3x Longbeard Map-Maker
3x Erebor Record Keeper
2x Gleowine
2x Lorien's Wealth
2x Ancestral Knowledge
2x Rumors From the Earth
1x Word of Command
1x Erebor Hammersmith
1x Self Preservation
1x Daughter of Nimrodel
Leadership Cards
3x Steward of Gondor
3x Sneak Attack
1x Brok Ironfist
Tactic Cards
3x Khazad! Khazad!
3x Feint
3x Quick Strike
2x Dwarven Axe
2x Blade of Gondolin
1x Ring Mail
1x Erebor Battle Master
Sideboard Cards
Ancestral Knowledge
Self Preservation
Word of Command
Miner of the Iron Hills
Lure of Moria
How to play: Make Bifur a Steward of Gondor because he is your engine. He will usually take resources from Dain as well. Dain is your defender. Most of the time he doesn't exhaust at all so that his bonuses apply to everyone else.