Two by Four — ruling 1

The effect of a base power 4 counter or base toughness 4 counter overrides any existing effects that set that creature’s base power or toughness, as appropriate. Any existing effects or counters that raise, lower, or switch a creature’s power and/or toughness continue to apply to the creature’s new base power or toughness. Any base power- or toughness-setting effects that start to apply after the counter is placed on the creature will overwrite the counter’s effect. (For the rules-savvy, yes, this applies in layer 7b.)

Two by Four — ruling 2

Playtest cards aren’t legal for play in any tournament format other than Mystery Booster Limited formats. On the other hand, we expect they will spice up a wide variety of non-tournament games (as long as everyone’s on the same page about using them!).

Two by Four — ruling 3

Playtest cards use a modified version of game symbols, such as {T} and {W}. These modified symbols should be treated as the standard symbols during play.

Two by Four — ruling 4

For many playtest cards, you’ll need to make a generous assumption that basic game rules would be updated to allow them to work. The Mystery Booster 2 Playtest Card Notes section (reproduced here in individual Gatherer rulings) provides guidance for fitting these cards into the existing rules structure.

Two by Four : règles, fonctionnement et interactions (MTG)

Two by Four 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

Choose one or both — • Put a base power 4 counter on target creature. • Put a base toughness 4 counter on target creature.

How it works : Two by Four

Original English text — Wizards of the Coast / Scryfall

#1November 8, 2024· Wizards of the Coast
The effect of a base power 4 counter or base toughness 4 counter overrides any existing effects that set that creature’s base power or toughness, as appropriate. Any existing effects or counters that raise, lower, or switch a creature’s power and/or toughness continue to apply to the creature’s new base power or toughness. Any base power- or toughness-setting effects that start to apply after the counter is placed on the creature will overwrite the counter’s effect. (For the rules-savvy, yes, this applies in layer 7b.)
No other card is named in this ruling.
#2November 8, 2024· Wizards of the Coast
Playtest cards aren’t legal for play in any tournament format other than Mystery Booster Limited formats. On the other hand, we expect they will spice up a wide variety of non-tournament games (as long as everyone’s on the same page about using them!).
No other card is named in this ruling.
#3November 8, 2024· Wizards of the Coast
Playtest cards use a modified version of game symbols, such as and . These modified symbols should be treated as the standard symbols during play.
No other card is named in this ruling.
#4November 8, 2024· Wizards of the Coast
For many playtest cards, you’ll need to make a generous assumption that basic game rules would be updated to allow them to work. The Mystery Booster 2 Playtest Card Notes section (reproduced here in individual Gatherer rulings) provides guidance for fitting these cards into the existing rules structure.
No other card is named in this ruling.