Wizard's Spellbook
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: Exile target instant or sorcery card from a graveyard. Roll a d20. Activate only as a sorcery.
1—9 | Copy that card. You may cast the copy.
10—19 | Copy that card. You may cast the copy by paying 
rather than paying its mana cost.
20 | Copy each card exiled with this artifact. You may cast any number of the copies without paying their mana costs.
Illustrated by Iris Compiet
Rulings (15)
Jul 23, 2021
An ability that tells you to roll a die will also specify what to do with the result of that roll. Most often, this is in the form of a "results table" in the card text.
Jul 23, 2021
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.
Jul 23, 2021
Dice are identified by the number of faces each one has. For example, a d20 is a twenty-sided die.
Jul 23, 2021
Dice used must have equally likely outcomes and the roll must be fair. Although physical dice are recommended, digital substitutes are allowed, provided they have the same number of equally likely outcomes as specified in the original roll instruction.
Jul 23, 2021
If you control multiple copies of Wizard's Spellbook, each one tracks the cards it has exiled separately.
Jul 23, 2021
If your result is 10–19, you may pay instead of its mana cost. You cannot pay its regular mana cost or any alternative costs the copy has. You may pay any additional costs and must pay mandatory additional costs.
Jul 23, 2021
If your result is 1–9, you must still pay all costs to cast the copy. You may pay any additional or alternative costs the spell has. If it has any mandatory additional costs, those must be paid.
Jul 23, 2021
If your result is 20, you may cast the copies without paying their mana costs. You cannot pay their regular mana costs or any alternative costs the copies have. You may pay any additional costs and must pay mandatory additional costs. You may cast the copies in any order you choose.
Jul 23, 2021
In all cases, any copies you don't cast cease to exist after the ability is finished resolving.
Jul 23, 2021
Some abilities, like that of Pixie Guide and Barbarian Class, replace rolling a die with rolling extra dice and ignoring the lowest roll. The ignored rolls are not considered for the effect that instructed you to roll a die, and do not cause abilities to trigger. For all intents and purposes, once you determine which dice count, any extra dice were never rolled.
Jul 23, 2021
Some effects instruct you to roll again. This uses the same number and type of dice as the original roll, and that roll will use the same set of possible outcomes.
Jul 23, 2021
Some effects may modify the result of a die roll. This may be part of the instruction to roll a die or it may come from other cards. Anything that references the "result" of a die roll is looking for the result after these modifications. Anything that is looking for the "natural result" is looking for the number shown on the face of the die before these modifications.
Jul 23, 2021
The instruction to roll a die and the effect that occurs because of the result are all part of the same ability. Players do not get the chance to respond to the ability after knowing the result of the roll.
Jul 23, 2021
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.
Jul 23, 2021
While playing Planechase, rolling the planar die will cause any ability that triggers whenever a player rolls one or more dice to trigger. However, any effect that refers to a numerical result will ignore the rolling of the planar die.
