Ondu Rising

If the non-awaken part of the spell doesn’t require a target and you cast the spell for its awaken cost, then the spell won’t resolve if the target land you control becomes illegal before the spell resolves (such as due to being destroyed in response to the spell being cast).

Ondu Rising creates a delayed triggered ability. Any creature that attacks that turn will cause that ability to trigger, including creatures controlled by a teammate and creatures you didn’t control or that didn’t exist as Ondu Rising resolved. Notably, this includes the land creature created if Ondu Rising is cast for its awaken cost.

If a spell with awaken has multiple targets (including the land you control), and some but not all of those targets become illegal by the time the spell tries to resolve, the spell won’t affect the illegal targets in any way.