You can play only two cards named "Spectacular Chain Explosion" per turn.

Trigger When 600 non-battle damage is dealt to your opponent by a single source ⇒ This card deals 400 damage to target player. Put up to one target card named "Spectacular Chain Explosion" from your graveyard into your standby area face down. If this card was played from a standby area, expel it as it resolves.