Halimar Tidecaller from the Battle for Zendikar block should make all land creatures you control have flying, but this ability currently doesn't work and other creatures don't fly.
(from forums)
By "land creatures", do they mean lands that happen to be creatures, or creatures that are on the land (aka. non-flying)?
A permanent with both the land and the creature cardtype. I will make a test for this.
The code looks fine. Tested screen uploaded.

Unable to duplicate with unit test either. Closing.
Most helpful comment
By "land creatures", do they mean lands that happen to be creatures, or creatures that are on the land (aka. non-flying)?