Erebos's Intervention — ruling 1

If you choose the first mode and the target creature is an illegal target by the time Erebos’s Intervention tries to resolve, the spell won’t resolve. You won’t gain X life.

Erebos's Intervention : règles, fonctionnement et interactions (MTG)

Erebos's Intervention 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

Choose one — • Target creature gets -X/-X until end of turn. You gain X life. • Exile up to twice X target cards from graveyards.

How it works : Erebos's Intervention

Original English text — Wizards of the Coast / Scryfall

#1January 24, 2020· Wizards of the Coast
If you choose the first mode and the target creature is an illegal target by the time Erebos’s Intervention tries to resolve, the spell won’t resolve. You won’t gain X life.
No other card is named in this ruling.