Louvaq, the Aberrant — ruling 1

A creature is modified if its text has been changed to modify its abilities, if it has gained or lost any abilities, or if a counter or an effect has set or changed its power or toughness.

Louvaq, the Aberrant — ruling 2

Most copy effects will cause a creature to be modified, although in some unusual cases the copy effect will leave it with the same power, toughness, and abilities. For example, a Runeclaw Bear that becomes a copy of Glory Seeker will, oddly enough, not be modified.

Louvaq, the Aberrant — ruling 3

If an effect only defined a * or ? symbol in a creature’s power or toughness, it isn’t modified.

Louvaq, the Aberrant — ruling 4

A creature isn’t modified if its controller, color, or types have been changed.

Louvaq, the Aberrant — ruling 5

A token’s “printed” abilities, power, and toughness are the values it was created with.

Louvaq, the Aberrant — ruling 6

A face-down permanent’s “printed” power and toughness are 2. It has no abilities.

Louvaq, the Aberrant — ruling 7

Certain kinds of cards (such as flip cards, adventurer cards, and double-, triple-, and four-faced cards) define alternative characteristics for those objects under certain circumstances. Using these alternative characteristics doesn’t count as being modified.

Louvaq, the Aberrant : règles, fonctionnement et interactions (MTG)

Louvaq, the Aberrant 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

Protection from modified creatures (Modified creatures have a power, toughness, or ability different than their printed versions.) At the beginning of each player's end step, you may put a +1/+1 counter on target creature that player controls.

How it works : Louvaq, the Aberrant

Original English text — Wizards of the Coast / Scryfall

#1November 12, 2019· Wizards of the Coast
A creature is modified if its text has been changed to modify its abilities, if it has gained or lost any abilities, or if a counter or an effect has set or changed its power or toughness.
No other card is named in this ruling.
#2November 12, 2019· Wizards of the Coast
Most copy effects will cause a creature to be modified, although in some unusual cases the copy effect will leave it with the same power, toughness, and abilities. For example, a Runeclaw Bear that becomes a copy of Glory Seeker will, oddly enough, not be modified.
No other card is named in this ruling.
#3November 12, 2019· Wizards of the Coast
If an effect only defined a * or ? symbol in a creature’s power or toughness, it isn’t modified.
No other card is named in this ruling.
#4November 12, 2019· Wizards of the Coast
A creature isn’t modified if its controller, color, or types have been changed.
No other card is named in this ruling.
#5November 12, 2019· Wizards of the Coast
A token’s “printed” abilities, power, and toughness are the values it was created with.
No other card is named in this ruling.
#6November 12, 2019· Wizards of the Coast
A face-down permanent’s “printed” power and toughness are 2. It has no abilities.
No other card is named in this ruling.
#7November 12, 2019· Wizards of the Coast
Certain kinds of cards (such as flip cards, adventurer cards, and double-, triple-, and four-faced cards) define alternative characteristics for those objects under certain circumstances. Using these alternative characteristics doesn’t count as being modified.
No other card is named in this ruling.