Merciless Repurposing — ruling 1

If the target of Merciless Repurposing is illegal as the spell tries to resolve, it won't resolve and none of its effects will happen. You won't incubate.

Merciless Repurposing : règles, fonctionnement et interactions (MTG)

Merciless Repurposing 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

Exile target creature. Incubate 3. (Create an Incubator token with three +1/+1 counters on it and ": Transform this token." It transforms into a 0/0 Phyrexian artifact creature.)

How it works : Merciless Repurposing

Original English text — Wizards of the Coast / Scryfall

#1April 14, 2023· Wizards of the Coast
If the target of Merciless Repurposing is illegal as the spell tries to resolve, it won't resolve and none of its effects will happen. You won't incubate.
No other card is named in this ruling.