Reinterpret — ruling 1

If a spell with {X} in its mana cost is countered this way, {X} is the value chosen as the spell was cast.

Reinterpret — ruling 2

This can be used to cast either face of a modal double-faced card, but only if the face you are casting has an equal or lesser mana value than the target spell.

Reinterpret — ruling 3

If you target a spell that can’t be countered, like Heated Debate, you won’t counter the spell, but you will get to cast a spell with an equal or lesser mana value.

Reinterpret — ruling 4

If you cast a spell “without paying its mana cost,” you can’t pay any alternative costs. You can, however, pay additional costs, such as kicker costs. If the card has any mandatory additional costs, you must pay those.

Reinterpret — ruling 5

If the spell you cast has {X} in its mana cost, you must choose 0 as the value of X.

Reinterpret : règles, fonctionnement et interactions (MTG)

Reinterpret 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

Counter target spell. You may cast a spell with equal or lesser mana value from your hand without paying its mana cost.

How it works : Reinterpret

Original English text — Wizards of the Coast / Scryfall

#1April 16, 2021· Wizards of the Coast
If a spell with in its mana cost is countered this way, is the value chosen as the spell was cast.
No other card is named in this ruling.
#2April 16, 2021· Wizards of the Coast
This can be used to cast either face of a modal double-faced card, but only if the face you are casting has an equal or lesser mana value than the target spell.
No other card is named in this ruling.
#3April 16, 2021· Wizards of the Coast
If you target a spell that can’t be countered, like Heated Debate, you won’t counter the spell, but you will get to cast a spell with an equal or lesser mana value.
No other card is named in this ruling.
#4April 16, 2021· Wizards of the Coast
If you cast a spell “without paying its mana cost,” you can’t pay any alternative costs. You can, however, pay additional costs, such as kicker costs. If the card has any mandatory additional costs, you must pay those.
No other card is named in this ruling.
#5April 16, 2021· Wizards of the Coast
If the spell you cast has in its mana cost, you must choose 0 as the value of X.
No other card is named in this ruling.