Mecha Phantom Beast Concoruda

The monster effect "While this card is face-up on the field, Tokens you control cannot be destroyed by battle or card effects" is a Continuous Effect.

The monster effect "If this card on the field is destroyed by an opponent's card and sent to the Graveyard: You can Tribute all Tokens you control; Special Summon 1 Level 4 or lower 'Mecha Phantom Beast' monster from your Graveyard" is a Trigger Effect that activates in the Graveyard. (This effect targets 1 Level 4 or lower "Mecha Phantom Beast" monster in your Graveyard.)

The monster effect "Special Summon 1 Level 4 or lower 'Mecha Phantom Beast' monster from your Graveyard" is an optional effect that can be activated if "Mecha Phantom Beast Concoruda" itself is destroyed by an opponent's monster in battle or by an opponent's card effect and sent to the Graveyard. (It can also be activated during the Damage Step.)

When activating the monster effect "Special Summon 1 Level 4 or lower 'Mecha Phantom Beast' monster from your Graveyard," you Tribute all Tokens in your Monster Zone as the cost.