Silver Surfer, Galactus's Herald 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

Flying When Silver Surfer enters, you may search your library for a card named Galactus, Devourer of Worlds, reveal it, put it into your hand, then shuffle. Whenever Silver Surfer deals combat damage to a player, until the end of your next turn, target creature attacks that player each combat if able.

How it works : Silver Surfer, Galactus's Herald

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 Silver Surfer, Galactus's Herald.

Galactus, Devourer of Worlds

Flying, trample, indestructible When Galactus enters, exile target permanent. Insatiable Hunger — Galactus attacks an opponent with the most life among your opponents each combat if able unless you control a creature named Silver Surfer, Galactus's Herald.