If Super Mega Death Rocket (SMDR) is discarded for Zaun Warren's Battlefield effect during a conquer, does SMDR trigger even though it wasn't in the trash at the start of the conquer phase?

Ruling: SMDR does not trigger upon the conquer if it is not in the trash when the trigger window occurs. The trigger window happens once at the start of the conquer phase, and if SMDR is not in the trash at that moment, it misses the timing.

Sequence:

• Conquer phase begins and SMDR trigger window opens
• If SMDR is not in trash at this moment, it cannot trigger
• Discarding SMDR later during the conquer (for Zaun Warren's effect) happens after the window has closed

Nuances:

• SMDR must already be in the trash when the conquer phase trigger window occurs to be eligible to trigger