606.3. A player may activate a loyalty ability of a permanent he or she controls any time he or she has priority and the stack is empty during a main phase of his or her turn, but only if no player has previously activated a loyalty ability of that permanent that turn.
This is the rule. As you can see, the restriction (bolded) won't allow you to activate a loyalty ability of a permanent that has already had one of its loyalty abilities activated that turn. A permanent that transforms is still the same permanent; transforming doesn't "reset" this.
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but what about Arlinn, Embraced by the Moon?
can she use an ability once per turn as well?
can you activate each side once per turn? (effectively netting you 2-pseudo-activations?)
or just the whole card once per turn, regardless of what side it's on and whether it transforms...?
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This is the rule. As you can see, the restriction (bolded) won't allow you to activate a loyalty ability of a permanent that has already had one of its loyalty abilities activated that turn. A permanent that transforms is still the same permanent; transforming doesn't "reset" this.