Is “mana weaving” allowed before the randomization of a deck?

The correct answer is that mana weaving is allowed before the randomization of a deck, provided that the deck is thoroughly shuffled afterward. The practice of mana weaving involves the intentional arrangement of lands and spells to ensure a desirable distribution of mana sources and spells in the early part of the game. However, this practice could lead to a non-random distribution of cards if not followed by a proper shuffle.

The most important aspect of this answer is that any advantage gained from mana weaving must be mitigated by shuffling the deck comprehensively afterward. This thorough shuffling ensures that the cards are randomized again, which is a key requirement in maintaining the integrity of the game. Magic: The Gathering emphasizes the importance of shuffling to prevent any intentional manipulation of card order that could affect the outcome of a match.

Options that suggest mana weaving is not permitted altogether, or that cards must remain untouched, do not align with the rules that allow for pre-game strategies as long as they do not compromise deck integrity after shuffling. Thus, option A is aligned with tournament policy, balancing player strategy with the necessity of maintaining randomness in gameplay.