Pinkie Pie 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

Whenever you cast a spell with a smile in its art, create a tapped Treasure token. Everypony's Invited — Your party consists of each creature you control, and your party is always full.

How it works : Pinkie Pie

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 Pinkie Pie.

Princess Twilight Sparkle

Flying Other Alicorns, Horses, Pegasi, Ponies, and Unicorns you control get +1/+1. {W}{U}{B}{R}{G}: If you control Applejack, Fluttershy, Pinkie Pie, Rainbow Dash, and Rarity, everypony wins the game.