Siege Modification — ruling 1

If Siege Modification becomes unattached from a Vehicle that’s attacking or blocking, that Vehicle will be removed from combat unless another effect (such as its crew ability) is also making it a creature.

Siege Modification : règles, fonctionnement et interactions (MTG)

Siege Modification 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

Enchant creature or Vehicle As long as enchanted permanent is a Vehicle, it's a creature in addition to its other types. Enchanted creature gets +3/+0 and has first strike.

How it works : Siege Modification

Original English text — Wizards of the Coast / Scryfall

#1February 9, 2017· Wizards of the Coast
If Siege Modification becomes unattached from a Vehicle that’s attacking or blocking, that Vehicle will be removed from combat unless another effect (such as its crew ability) is also making it a creature.
No other card is named in this ruling.