Starnheim Aspirant — ruling 1

To determine the total cost of a spell, start with the mana cost or alternative cost you're paying, add any cost increases, then apply any cost reductions (such as that of Starnheim Aspirant). The mana value of the spell is determined only by its mana cost, no matter what the total cost to cast the spell was.

Starnheim Aspirant — ruling 2

The cost reduction applies only to generic mana in the costs of Angel spells you cast. It can't reduce requirements of specific colors of mana.

Starnheim Aspirant — ruling 3

An Angel spell is a creature spell with the creature type Angel. Instant, sorcery, and enchantment cards that may create Angel tokens are not Angel spells.

Starnheim Aspirant : règles, fonctionnement et interactions (MTG)

Starnheim Aspirant 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

Angel spells you cast cost less to cast.

How it works : Starnheim Aspirant

Original English text — Wizards of the Coast / Scryfall

#1February 5, 2021· Wizards of the Coast
To determine the total cost of a spell, start with the mana cost or alternative cost you're paying, add any cost increases, then apply any cost reductions (such as that of Starnheim Aspirant). The mana value of the spell is determined only by its mana cost, no matter what the total cost to cast the spell was.
No other card is named in this ruling.
#2February 5, 2021· Wizards of the Coast
The cost reduction applies only to generic mana in the costs of Angel spells you cast. It can't reduce requirements of specific colors of mana.
No other card is named in this ruling.
#3February 5, 2021· Wizards of the Coast
An Angel spell is a creature spell with the creature type Angel. Instant, sorcery, and enchantment cards that may create Angel tokens are not Angel spells.
No other card is named in this ruling.