Edison format ruling
Blast Asmodian

Card effect (current official text)If any Spell or Trap Card(s) are Chained, inflict 500 damage to your opponent.
Rulings
- If you activate "Call of the Haunted" targeting "Blast Asmodian", then another card is chained to "Call of the Haunted", the effect of "Blast Asmodian" does not activate and inflict damage after the chain resolves.
- Only Spell and Trap Card activations will activate the effect of "Blast Asmodian". Effects that may activate from previously-activated Spell and Trap Cards are not taken into account.
- Blast Asmodian's effect is a Trigger Effect. When it activates you can chain the activation of a Spell or Trap Card. After that chain resolves, Blast Asmodian's effect will Trigger again, and start a new chain.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Edison forum — sourced change requests get reviewed.