Can Super Mega Death Rocket's conquer trigger be added to the chain if it gets discarded to the trash by another conquer trigger during the same conquer event?

Ruling: Super Mega Death Rocket's trigger cannot be retroactively added if it moves to the trash while other conquer triggers are resolving. All conquer triggers are evaluated at the same moment when the conquer occurs.

Sequence:

• When a conquer occurs, all conquer triggers are evaluated at that moment
• For SMDR's trigger to be added to the chain, it must already be in the trash when the conquer happens
• If SMDR is discarded by another conquer trigger during resolution, its trigger won't be retroactively added

Nuances:

• This differs from Immortal Phoenix, which checks its condition ("when a spell kills") after the spell fully resolves, at which point Phoenix is already in the trash
• The key distinction is "when the condition is met" - SMDR's condition must be met at the moment of conquer, not during the resolution of other conquer triggers