Resplendent Marshal — ruling 1

You don’t choose which creature card you’re exiling, if any, until the triggered ability is resolving. When you do, the reflexive triggered ability triggers. Players may respond to this reflexive triggered ability, knowing the creature types of the card you exiled and which creatures might get a +1/+1 counter. This is different than effects that say “If you do” in that players may take actions after you’ve exiled another creature card but before putting counters on other creatures you control.

Resplendent Marshal : règles, fonctionnement et interactions (MTG)

Resplendent Marshal 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

Flying When this creature enters or dies, you may exile another creature card from your graveyard. When you do, put a +1/+1 counter on each creature you control other than this creature that shares a creature type with the exiled card.

How it works : Resplendent Marshal

Original English text — Wizards of the Coast / Scryfall

#1February 5, 2021· Wizards of the Coast
You don’t choose which creature card you’re exiling, if any, until the triggered ability is resolving. When you do, the reflexive triggered ability triggers. Players may respond to this reflexive triggered ability, knowing the creature types of the card you exiled and which creatures might get a +1/+1 counter. This is different than effects that say “If you do” in that players may take actions after you’ve exiled another creature card but before putting counters on other creatures you control.
No other card is named in this ruling.