Chandra's Pyreling — ruling 1

Combat damage is the damage that's dealt automatically by attacking and blocking creatures. Any other damage is noncombat damage, even if it's dealt during a combat phase by an attacking or blocking creature.

Chandra's Pyreling — ruling 2

The ability of Chandra's Pyreling triggers just once per event for each opponent who is dealt noncombat damage by a source you control, regardless of how much damage that player is dealt. For example, if a sorcery you control deals 2 damage to each opponent in a four-player game, the ability will trigger three times.

Chandra's Pyreling : règles, fonctionnement et interactions (MTG)

Chandra's Pyreling 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 source you control deals noncombat damage to an opponent, this creature gets +1/+0 and gains double strike until end of turn. (It deals both first-strike and regular combat damage.)

How it works : Chandra's Pyreling

Original English text — Wizards of the Coast / Scryfall

#1June 23, 2020· Wizards of the Coast
Combat damage is the damage that's dealt automatically by attacking and blocking creatures. Any other damage is noncombat damage, even if it's dealt during a combat phase by an attacking or blocking creature.
No other card is named in this ruling.
#2June 23, 2020· Wizards of the Coast
The ability of Chandra's Pyreling triggers just once per event for each opponent who is dealt noncombat damage by a source you control, regardless of how much damage that player is dealt. For example, if a sorcery you control deals 2 damage to each opponent in a four-player game, the ability will trigger three times.
No other card is named in this ruling.