Lithoform Blight - doesn't create support [As Designed]

Lithoform Blight

When the opponent doesn’t control a land support, the spell casts and draws me a card, but doesn’t create the Blighted Lithoform support.

Isn’t that as it is supposed to act?

first you exile and then your support appears, but since first didn’t happen in your description above, it follows that the second part will not happen either.

But perhaps you are referring to a prompt to cast the card, when the opponent do not have a land support on the board?

GD: This is the correct behavior. The token is only created if exiling an enemy’s land and the “draw a card” effect is a separate effect that happens regardless of whether the enemy has a land card or not.