Shapers' Sanctuary — ruling 1

The triggered ability of Shapers’ Sanctuary resolves before the spell or ability that caused it to trigger.

Shapers' Sanctuary — ruling 2

Players can cast spells and activate abilities after the triggered ability of Shapers’ Sanctuary resolves but before the spell or ability that caused it to trigger does. Notably, the card you draw may be able to counter that spell or ability.

Shapers' Sanctuary : règles, fonctionnement et interactions (MTG)

Shapers' Sanctuary 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 a creature you control becomes the target of a spell or ability an opponent controls, you may draw a card.

How it works : Shapers' Sanctuary

Original English text — Wizards of the Coast / Scryfall

#1September 29, 2017· Wizards of the Coast
The triggered ability of Shapers’ Sanctuary resolves before the spell or ability that caused it to trigger.
No other card is named in this ruling.
#2September 29, 2017· Wizards of the Coast
Players can cast spells and activate abilities after the triggered ability of Shapers’ Sanctuary resolves but before the spell or ability that caused it to trigger does. Notably, the card you draw may be able to counter that spell or ability.
No other card is named in this ruling.