I have an Elvish Mystic (EM) and Pharika Mender (PM) in my graveyard, and a Gray Merchant of Asphodel (GMOA)on the battlefield. At the end of my opponent's turn, I play Rescue from The Underworld (RFTU), sacrificing my GMOA as the additional cost to cast it. I choose PM as my target for RFTU.
During my upkeep, GMOA and PM enters the battlefield and their trigger are put on the stack. I place PM's trigger first, and then GMOA's trigger.
In respond to GMOA's trigger, my opponent kills GMOA, and then GMOA's trigger resolves -- which means PM's trigger resolves next.
When PM's trigger resolves, am I able to target GMOA to return it to my hand?