If a die is rerolled, the original roll essentially never happened: it doesn't cause any abilities to trigger, and no effect that cares about die rolls will consider it.
Monoxa, Midway Manager
The die roll caused by the activated ability has no inherent effect: you just roll a six-sided die, but any ability that triggers whenever you roll a die will trigger. Abilities that trigger whenever you roll a specific result, such as Monoxa's first ability, may also trigger.
Each die is identified by the number of faces it has. A six-sided die is a die with six equally likely outcomes: 1, 2, 3, 4, 5, and 6. The roll must be fair. Although physical dice are recommended, digital substitutes are allowed except in cases where the physical die is required for the effect.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Igor Grechanyi
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