Rising Populace — ruling 1

If a planeswalker that’s also a creature dies, Rising Populace’s ability triggers only once.

Rising Populace — ruling 2

If Rising Populace and another creature you control die simultaneously (perhaps because they were both dealt lethal damage in combat), Rising Populace won’t be on the battlefield as its triggered ability resolves. It can’t be saved by the +1/+1 counter that would have been put on it.

Rising Populace : règles, fonctionnement et interactions (MTG)

Rising Populace 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 another creature or planeswalker you control dies, put a +1/+1 counter on this creature.

How it works : Rising Populace

Original English text — Wizards of the Coast / Scryfall

#1May 3, 2019· Wizards of the Coast
If a planeswalker that’s also a creature dies, Rising Populace’s ability triggers only once.
No other card is named in this ruling.
#2May 3, 2019· Wizards of the Coast
If Rising Populace and another creature you control die simultaneously (perhaps because they were both dealt lethal damage in combat), Rising Populace won’t be on the battlefield as its triggered ability resolves. It can’t be saved by the +1/+1 counter that would have been put on it.
No other card is named in this ruling.