Can you conquer a battlefield, discard Super Mega Death Rocket from the battlefield's conquer effect, and then trigger SMDR's ability to take it from the trash?

Ruling: No, Super Mega Death Rocket must already be in the trash when you conquer in order to trigger its ability. If it's discarded as part of the battlefield's conquer trigger, it's too late to trigger.

Sequence:

• You conquer
• All conquer triggers go on the chain (including the battlefield's trigger)
• You resolve the chain

Nuances:

• SMDR is still in your hand when the conquer triggers go on the chain, so it cannot send its trigger to the chain at that point
• After the chain resolves and SMDR is discarded, it's too late for its trigger to activate