The Fountain in the Sky

 This fountain appears in the artwork of Rebirth of Parshath.

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This implies that the fountain might be located close to The Sanctuary in the Sky, which is related to Parshath archetype.

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TCG Rulings

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This effect starts a Chain. Removing the monster from play is a cost..: The Shining Darkness Sneak Peek -- Card Rulings (Version 1.0)

You can also activate this effect when your monster that your opponent controls is destroyed by battle and sent to your Graveyard.

The monster has to be a LIGHT monster on the field as well as in the Graveyard in order to activate the effect of "The Fountain in the Sky".

You cannot activate the effect of "The Fountain in the Sky" when a monster with 0 ATK is sent to the Graveyard.

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OCG Rulings

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Removing from play one LIGHT monster from your Graveyard is a cost to activate the effect of "The Fountain in the Sky".: Spell Card > The Fountain in the Sky

You can activate the effect of "The Fountain in the Sky" even if a monster on your opponent's side of the field is destroyed and sent to your Graveyard.

The effect of "The Fountain in the Sky" starts a Chain Link.