Jean-Luc Picard, Luminary 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 another historic permanent you control with mana value 3 or greater enters, draw a card. (Artifacts, legendaries, and Sagas are historic.) Seek out — Whenever you draw your second card each turn, put a +1/+1 counter on up to one other target creature and two charge counters on up to one target Spacecraft.