Can Super Mega Death Rocket be added back to hand via its own effect if you don't have a discard?

Ruling: If you have no cards in hand, you cannot get Super Mega Death Rocket back from trash.

Nuances:

• The ability still triggers even if you have no cards in hand
• You could use other abilities to draw a card before Rocket tries to resolve, which would then allow you to discard and return it to hand