Glass Asp — ruling 1

After Glass Asp’s triggered ability resolves, the affected player has the ability to perform a special action of paying {2}. This action may be performed any time the player has priority, and it doesn’t use the stack. It may be performed only once. Once that player’s next draw step begins, the player no longer has the ability to perform this action. If the player performed the action, the delayed “lose 2 life” triggered ability won’t trigger. Otherwise, it will.

Glass Asp : règles, fonctionnement et interactions (MTG)

Glass Asp 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

Whenever this creature deals combat damage to a player, that player loses 2 life at the beginning of their next draw step unless they pay before that step.

How it works : Glass Asp

Original English text — Wizards of the Coast / Scryfall

#1September 25, 2006· Wizards of the Coast
After Glass Asp’s triggered ability resolves, the affected player has the ability to perform a special action of paying . This action may be performed any time the player has priority, and it doesn’t use the stack. It may be performed only once. Once that player’s next draw step begins, the player no longer has the ability to perform this action. If the player performed the action, the delayed “lose 2 life” triggered ability won’t trigger. Otherwise, it will.
No other card is named in this ruling.