Labyrinth Adversary — ruling 1

You don’t choose a target for Labyrinth Adversary’s last ability at the time it triggers. Rather, a second “reflexive” ability triggers when you pay {1}{R} this way. You choose a target for that ability as it goes on the stack. Each player may respond to this triggered ability as normal.

Labyrinth Adversary : règles, fonctionnement et interactions (MTG)

Labyrinth Adversary 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

Trample (This creature can deal excess combat damage to the player it's attacking.) Whenever you attack, you may pay . When you do, target creature can't block this turn.

How it works : Labyrinth Adversary

Original English text — Wizards of the Coast / Scryfall

#1July 5, 2024· Wizards of the Coast
You don’t choose a target for Labyrinth Adversary’s last ability at the time it triggers. Rather, a second “reflexive” ability triggers when you pay this way. You choose a target for that ability as it goes on the stack. Each player may respond to this triggered ability as normal.
No other card is named in this ruling.