Have another player keep time and announce when the ten seconds are up. If you’re still touching any cards in your library when time is up, you have to shuffle your library, undoing your ordering.

You can’t change the contents of the library.

At the end of the ten seconds, your library must again be a single face-down pile of cards. If it’s not, you must shuffle your library, even if you weren’t touching it when time expired.

Hot Fix : règles, fonctionnement et interactions (MTG)

Hot Fix 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

You have ten seconds to look at and rearrange the cards in your library. At the end of those ten seconds, if you're touching one or more of those cards, shuffle.

How it works : Hot Fix

Original English text — Wizards of the Coast / Scryfall

#1January 19, 2018· Wizards of the Coast
Have another player keep time and announce when the ten seconds are up. If you’re still touching any cards in your library when time is up, you have to shuffle your library, undoing your ordering.
No other card is named in this ruling.
#2January 19, 2018· Wizards of the Coast
You can’t change the contents of the library.
No other card is named in this ruling.
#3January 19, 2018· Wizards of the Coast
At the end of the ten seconds, your library must again be a single face-down pile of cards. If it’s not, you must shuffle your library, even if you weren’t touching it when time expired.
No other card is named in this ruling.