Can Rhasa be played for just 1 chaos energy using Last Rites (when conquering/holding) if Rhasa is in your trash with 20+ cards, even though Rhasa's cost reduction is based on trash count?

Ruling: Yes, you can cast Rhasa for 1 chaos energy using Last Rites when it's in your trash. Passive abilities that alter costs apply at all times in any zone from which the card can be played, so Rhasa's cost reduction based on trash count applies while it's in the trash.

Nuances:

• Rhasa discounts itself when being cast from the trash (the card itself counts toward the trash total for its own cost reduction)