Mangara, the Diplomat — ruling 1

If your opponent attacks you with one creature and your planeswalker with another, you draw a card.

Mangara, the Diplomat — ruling 2

Players can cast spells and activate abilities after the triggered ability resolves but before the spell that caused it to trigger does.

Mangara, the Diplomat — ruling 3

If some of the attacking creatures leave the battlefield while Mangara's triggered ability is on the stack, use the player or planeswalker they were attacking before they left to determine whether you draw a card. On the other hand, if they're removed from combat without leaving the battlefield, use their current information to determine that they're not attacking you or a planeswalker you control anymore.

Mangara, the Diplomat — ruling 4

An ability that triggers when a player casts a spell resolves before the spell that caused it to trigger. It resolves even if that spell is countered.

Mangara, the Diplomat — ruling 5

You draw just one card, no matter how many creatures are attacking you and your planeswalkers beyond the second.

Mangara, the Diplomat : règles, fonctionnement et interactions (MTG)

Mangara, the Diplomat 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

Lifelink Whenever an opponent attacks with creatures, if two or more of those creatures are attacking you and/or planeswalkers you control, draw a card. Whenever an opponent casts their second spell each turn, draw a card.

How it works : Mangara, the Diplomat

Original English text — Wizards of the Coast / Scryfall

#1June 23, 2020· Wizards of the Coast
If your opponent attacks you with one creature and your planeswalker with another, you draw a card.
No other card is named in this ruling.
#2June 23, 2020· Wizards of the Coast
Players can cast spells and activate abilities after the triggered ability resolves but before the spell that caused it to trigger does.
No other card is named in this ruling.
#3June 23, 2020· Wizards of the Coast
If some of the attacking creatures leave the battlefield while Mangara's triggered ability is on the stack, use the player or planeswalker they were attacking before they left to determine whether you draw a card. On the other hand, if they're removed from combat without leaving the battlefield, use their current information to determine that they're not attacking you or a planeswalker you control anymore.
No other card is named in this ruling.
#4June 23, 2020· Wizards of the Coast
An ability that triggers when a player casts a spell resolves before the spell that caused it to trigger. It resolves even if that spell is countered.
No other card is named in this ruling.
#5June 23, 2020· Wizards of the Coast
You draw just one card, no matter how many creatures are attacking you and your planeswalkers beyond the second.
No other card is named in this ruling.