Pirate 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.

Official card text

Menace (This creature can't be blocked except by two or more creatures.)

How it works : Pirate

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 Pirate.

The Indomitable

Trample Whenever a creature you control deals combat damage to a player, draw a card. Crew 3 You may cast this card from your graveyard as long as you control three or more tapped Pirates and/or Vehicles.

Malcolm, Keen-Eyed Navigator

Flying Whenever one or more Pirates you control deal damage to your opponents, you create a Treasure token for each opponent dealt damage. (It's an artifact with "{T}, Sacrifice this token: Add one mana of any color.") Partner (You can have two commanders if both have partner.)

Breeches, Eager Pillager

First strike Whenever a Pirate you control attacks, choose one that hasn't been chosen this turn — • Create a Treasure token. • Target creature can't block this turn. • Exile the top card of your library. You may play it this turn.

Coercive Recruiter

Whenever this creature or another Pirate you control enters, gain control of target creature until end of turn. Untap that creature. Until end of turn, it gains haste and becomes a Pirate in addition to its other types.

Breeches, Brazen Plunderer

Menace Whenever one or more Pirates you control deal damage to your opponents, exile the top card of each of those opponents' libraries. You may play those cards this turn, and you may spend mana as though it were mana of any color to cast those spells. Partner (You can have two commanders if both have partner.)

Corsair Captain

When this creature enters, create a Treasure token. (It's an artifact with "{T}, Sacrifice this token: Add one mana of any color.") Other Pirates you control get +1/+1.

Don Andres, the Renegade

Each creature you control but don't own gets +2/+2, has menace and deathtouch, and is a Pirate in addition to its other types. Whenever you cast a noncreature spell you don't own, create two tapped Treasure tokens.

Mary Read and Anne Bonny

Haste {T}: Draw a card, then discard a card. Whenever you discard an Island, Pirate, or Vehicle card, create a tapped Treasure token.

Ramirez DePietro, Pillager

When Ramirez DePietro enters, you lose 2 life and create two Treasure tokens. Whenever one or more Pirates you control deal combat damage to a player, exile the top card of that player's library. You may cast that card for as long as it remains exiled.

Edward Kenway

At the beginning of your end step, create a Treasure token for each tapped Assassin, Pirate, and/or Vehicle you control. Whenever a Vehicle you control deals combat damage to a player, look at the top card of that player's library, then exile it face down. You may play that card for as long as it remains exiled.

Gemcutter Buccaneer

Whenever this creature or another Pirate you control enters, create a tapped Treasure token. Treasures you control are Equipment in addition to their other types and have "Equipped creature gets +2/+0," equip Pirate {1}, and equip {3}.

Skeleton Crew

Each other creature you control that's a Skeleton or Pirate gets +1/+1. Whenever one or more creature cards leave your graveyard, create a 2/2 black Skeleton Pirate creature token. (This ability triggers only from the battlefield.) {5}{B}: Return this card from your graveyard to the battlefield tapped.