Assume this state: I have Anax, Hardened in the Forge, which I own, on the battlefield. I've attacked with Robber of the Rich and exiled Chittering Harvester. Chittering Harvester has the "standard" mutate text on it:
If you cast this spell for its mutate cost, put it over or under target non-Human creature you own
To select a valid target I'm looking at the rules. Rule 109.5 says:
The words “you” and “your” on an object refer to the object’s controller, its would-be controller (if a player is attempting to play, cast, or activate it), or its owner (if it has no controller).
Rule 601.2a says:
To propose the casting of a spell, a player first moves that card (...) from where it is to the stack. It becomes the topmost object on the stack. (...), and that player becomes its controller.
According to these you on the Chittering Harvester should refer to me and I should be able to target Anax.
On the other hand rule 702.139a forbids this:
(...) targets a non-Human creature with the same owner as this spell
And based on 112.2, Chittering Harvester's owner is my opponent:
A spell’s owner is the same as the owner of the card that represents it.
According to the above two rules you on the Chittering Harvester should refer to my opponent and I can't target Anax.
So do rules 109.5 and 601.2a contradict rules 112.2 and 702.139a?