Fireblade Artist — ruling 1

Fireblade Artist's triggered ability goes on the stack without a target. While that ability is resolving, you may sacrifice a creature. When you do, the reflexive triggered ability triggers and you pick a target opponent or planeswalker to be dealt damage. This is different from effects that say "If you do . . ." in that players may take actions after you've sacrificed the creature but before damage is dealt.

Fireblade Artist : règles, fonctionnement et interactions (MTG)

Fireblade Artist 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

Haste At the beginning of your upkeep, you may sacrifice a creature. When you do, this creature deals 2 damage to target opponent or planeswalker.

How it works : Fireblade Artist

Original English text — Wizards of the Coast / Scryfall

#1January 25, 2019· Wizards of the Coast
Fireblade Artist's triggered ability goes on the stack without a target. While that ability is resolving, you may sacrifice a creature. When you do, the reflexive triggered ability triggers and you pick a target opponent or planeswalker to be dealt damage. This is different from effects that say "If you do . . ." in that players may take actions after you've sacrificed the creature but before damage is dealt.
No other card is named in this ruling.