I have Feather, the Redeemed on the battlefield and cast a spell (let's say Ondu Rising) for its awaken cost.
If I target a land that is already a creature, then I already know that Feather's ability triggers the substitution effect and I exile my Ondu Rising and get it back at end of turn, but...
What happens if I target one of my non-creature lands with the Awaken part of the spell?
Since the land becomes a creature during the resolution of the spell AND is not a new object as it never left the battlefield, does it still count as targeting one of my creatures?
Feather's triggered ability cares what the instant or sorcery spell targets only at the time the spell is cast (C.R. 601.2i, 603.2). The ability doesn't care what the spell targets at any other time, including when that spell or that ability would resolve (Feather's triggered ability doesn't have an intervening "if" clause, for example [C.R. 603.4; compare that ability with Ink-Treader Nephilim's]). (However, a spell with targets will fail to resolve if all of them are illegal [C.R. 608.2b].) Notably, Feather's triggered ability won't trigger if the spell didn't target a "creature you control[led]" at the time the spell was cast, but the spell then targets a "creature you control" afterwards (whether because one of that spell's targets became a "creature you control" due to awaken [C.R. 702.112a], because one of that spell's targets changed from a player to a "creature you control", or otherwise). See also this thread, this thread, and this thread.
Thus, for example, if Ondu Rising targeted a noncreature land as you cast that spell, Feather's triggered ability won't trigger for that spell, even if that land is a creature you control by the time Ondu Rising resolves (C.R. 702.112a).
Similarly, if Lightning Bolt targeted a player as you cast that spell, Feather's triggered ability won't trigger for that spell, even if Lightning Bolt's target then changes to a creature you control due to Redirect (C.R. 114.4).
EDIT (May 15): Add link to another relevant thread.
EDIT (May 16, 2019; May 21, 2020): Clarification.
If I target a land that is already a creature, then I already know that Feather's ability triggers the substitution effect and I exile my Ondu Rising and get it back at end of turn, but...
What happens if I target one of my non-creature lands with the Awaken part of the spell?
Since the land becomes a creature during the resolution of the spell AND is not a new object as it never left the battlefield, does it still count as targeting one of my creatures?
Thanks in advance for the answers.
Thus, for example, if Ondu Rising targeted a noncreature land as you cast that spell, Feather's triggered ability won't trigger for that spell, even if that land is a creature you control by the time Ondu Rising resolves (C.R. 702.112a).
Similarly, if Lightning Bolt targeted a player as you cast that spell, Feather's triggered ability won't trigger for that spell, even if Lightning Bolt's target then changes to a creature you control due to Redirect (C.R. 114.4).
EDIT (May 15): Add link to another relevant thread.
EDIT (May 16, 2019; May 21, 2020): Clarification.