Mutagen Connoisseur — ruling 1

A "transformed permanent" is a double-faced permanent with its back face up. Notably, modal double-faced permanents and melded permanents are never transformed permanents, no matter which faces are up.

Mutagen Connoisseur : règles, fonctionnement et interactions (MTG)

Mutagen Connoisseur 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

Flying, vigilance This creature gets +1/+0 for each transformed permanent you control.

How it works : Mutagen Connoisseur

Original English text — Wizards of the Coast / Scryfall

#1April 14, 2023· Wizards of the Coast
A "transformed permanent" is a double-faced permanent with its back face up. Notably, modal double-faced permanents and melded permanents are never transformed permanents, no matter which faces are up.
No other card is named in this ruling.