Illusionary Terrain — ruling 1

Will not add or remove the supertype snow to or from a land.

Illusionary Terrain : règles, fonctionnement et interactions (MTG)

Illusionary Terrain 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

Cumulative upkeep (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.) As this enchantment enters, choose two basic land types. Basic lands of the first chosen type are the second chosen type.