Tournament events have more specific rules regarding dice and die-rolling. For more information, please see the most recent version of the Magic Tournament Rules at https://wpn.wizards.com/en/document/magic-gathering-tournament-rules.
Reckless Endeavor
Dice are identified by the number of faces each one has. For example, a d20 is a twenty-sided die.
An effect that says “choose a target, then roll a d20” or similar still uses the normal process of putting an ability on the stack and resolving it. Choosing targets is part of putting the ability on the stack and rolling the d20 happens later, as the ability resolves.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Stephen Andrade
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