Sumala Sentry — ruling 1

If the permanent that was turned face up is no longer on the battlefield when Sumala Sentry's triggered ability resolves, you'll still put a +1/+1 counter on Sumala Sentry. Similarly, if Sumala Sentry is no longer on the battlefield, you'll still put a +1/+1 counter on the permanent that turned face up.

Sumala Sentry : règles, fonctionnement et interactions (MTG)

Sumala Sentry 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

Reach Whenever a face-down permanent you control is turned face up, put a +1/+1 counter on it and a +1/+1 counter on this creature.

How it works : Sumala Sentry

Original English text — Wizards of the Coast / Scryfall

#1February 2, 2024· Wizards of the Coast
If the permanent that was turned face up is no longer on the battlefield when Sumala Sentry's triggered ability resolves, you'll still put a +1/+1 counter on Sumala Sentry. Similarly, if Sumala Sentry is no longer on the battlefield, you'll still put a +1/+1 counter on the permanent that turned face up.
No other card is named in this ruling.