Dwarf is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

How it works : Dwarf

Original English text — Wizards of the Coast / Scryfall

No additional ruling has been published for this card.

Interactions with other cards

These cards' text mentions Dwarf.

Magda, Brazen Outlaw

Other Dwarves you control get +1/+0. Whenever a Dwarf you control becomes tapped, create a Treasure token. Sacrifice five Treasures: Search your library for an artifact or Dragon card, put that card onto the battlefield, then shuffle.

Dwarven Mine

({T}: Add {R}.) This land enters tapped unless you control three or more other Mountains. When this land enters untapped, create a 1/1 red Dwarf creature token.

Doors of Durin

Whenever you attack, scry 2, then you may reveal the top card of your library. If a creature card is revealed this way, put it onto the battlefield tapped and attacking. Until your next turn, it gains trample if you control a Dwarf and hexproof if you control an Elf.

Kíli the Resourceful

Storied (If you control three or more artifacts, legendaries, and/or Sagas, you have an enduring story for the rest of the game.) As long as you have an enduring story, you may pay {0} rather than pay the equip cost of the first equip ability you activate each turn. Whenever another Dwarf or Equipment you control enters, draw a card. This ability triggers only once each turn.

The Lonely Mountain

({T}: Add {R}.) This land enters tapped unless you control an Equipment. {4}{R}, {T}: Create a 2/2 red Dwarf creature token. This ability costs {1} less to activate for each Equipment you control. Activate only as a sorcery.

Armed and Armored

Vehicles you control become artifact creatures until end of turn. Choose a Dwarf you control. Attach any number of Equipment you control to it.

An Unexpected Party // At the Door

As this enchantment enters, choose a creature type. Creatures you control of the chosen type get +2/+2. Create X 2/2 red Dwarf creature tokens. (Then exile this card. You may cast the enchantment later from exile.)

Bearded Axe

Equipped creature gets +1/+1 for each Dwarf, Equipment, and/or Vehicle you control. Equip {2}

Fíli and Kíli, Joyous

Haste {T}: Add {R}{R}. Spend this mana only to cast Dwarf, Equipment, and Saga spells.

Dwarven Recruiter

When this creature enters, search your library for any number of Dwarf cards, reveal them, then shuffle and put those cards on top in any order.

Dwarven Bloodboiler

Tap an untapped Dwarf you control: Target creature gets +2/+0 until end of turn.

Fíli the Pathfinder

Storied (If you control three or more artifacts, legendaries, and/or Sagas, you have an enduring story for the rest of the game.) As long as you have an enduring story, creatures you control get +1/+1. Whenever Fíli or another nontoken Dwarf you control enters, create a 2/2 red Dwarf creature token.