If you grow your LRIG to a lower level or limit than this SIGNI, you may send this SIGNI to the trash.
When you use this SIGNI's second [Constant] ability to retrieve a SIGNI, the retrieved SIGNI may be played anywhere in the SIGNI Zone; it does not need to return to where it originally was prior to being banished.
If this SIGNI's second [Constant] ability returns a SIGNI to the field during the Attack Step of the Attack Phase, the returned SIGNI may attack again.
After your opponent's effect, Alphard will now exist in the Ener Zone, therefore is unable to banish herself for her second [Constant].
If you play a Resona while Alphard, Natural Star is in your Ener Zone, you may pay for Alphard's third [Constant] ability using herself, thereby placing her into the trash, to be played onto the field by her ability.