Doublecast — ruling 1

If you cast one Doublecast after another, you’ll copy the second Doublecast. Each resolves, creating two delayed triggered abilities. The next spell you cast after that will be copied twice. If that spell is also a Doublecast, the following spell will be copied three times, and so on.

Doublecast — ruling 2

Doublecast’s ability will copy any instant or sorcery spell, not just one with targets.

Doublecast — ruling 3

A copy is created even if the spell that caused Doublecast’s ability to trigger has been countered by the time that ability resolves. The copy resolves before the original spell.

Doublecast — ruling 4

The copy will have the same targets as the spell it’s copying unless you choose new ones. You may change any number of the targets, including all of them or none of them. The new targets must be legal.

Doublecast — ruling 5

If the spell that’s copied is modal (that is, it says “Choose one —” or the like), the copy will have the same mode or modes. You can’t choose different ones.

Doublecast — ruling 6

If the spell that’s copied has an X whose value was determined as it was cast, the copy has the same value of X.

Doublecast — ruling 7

You can’t choose to pay any additional costs for the copy. However, effects based on any additional costs that were paid for the original spell are copied as though those same costs were paid for the copy too.

Doublecast — ruling 8

The copy that Doublecast’s ability creates is created on the stack, so it’s not “cast.” Abilities that trigger when a player casts a spell won’t trigger.

Doublecast : règles, fonctionnement et interactions (MTG)

Doublecast 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

When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy.

How it works : Doublecast

Original English text — Wizards of the Coast / Scryfall

#1July 13, 2018· Wizards of the Coast
If you cast one Doublecast after another, you’ll copy the second Doublecast. Each resolves, creating two delayed triggered abilities. The next spell you cast after that will be copied twice. If that spell is also a Doublecast, the following spell will be copied three times, and so on.
No other card is named in this ruling.
#2July 13, 2018· Wizards of the Coast
Doublecast’s ability will copy any instant or sorcery spell, not just one with targets.
No other card is named in this ruling.
#3July 13, 2018· Wizards of the Coast
A copy is created even if the spell that caused Doublecast’s ability to trigger has been countered by the time that ability resolves. The copy resolves before the original spell.
No other card is named in this ruling.
#4July 13, 2018· Wizards of the Coast
The copy will have the same targets as the spell it’s copying unless you choose new ones. You may change any number of the targets, including all of them or none of them. The new targets must be legal.
No other card is named in this ruling.
#5July 13, 2018· Wizards of the Coast
If the spell that’s copied is modal (that is, it says “Choose one —” or the like), the copy will have the same mode or modes. You can’t choose different ones.
No other card is named in this ruling.
#6July 13, 2018· Wizards of the Coast
If the spell that’s copied has an X whose value was determined as it was cast, the copy has the same value of X.
No other card is named in this ruling.
#7July 13, 2018· Wizards of the Coast
You can’t choose to pay any additional costs for the copy. However, effects based on any additional costs that were paid for the original spell are copied as though those same costs were paid for the copy too.
No other card is named in this ruling.
#8July 13, 2018· Wizards of the Coast
The copy that Doublecast’s ability creates is created on the stack, so it’s not “cast.” Abilities that trigger when a player casts a spell won’t trigger.
No other card is named in this ruling.