If Ferrous Forerunner dies while equipped with Svellsongur, does its Deathknell trigger twice (from the gear effect) or does the gear detach on death, preventing the double trigger?

Ruling: Ferrous Forerunner's Deathknell triggers twice when equipped with Svellsongur. Deathknell triggers before cards go to trash, so Ferrous will still have Svellsongur attached when the Deathknell triggers resolve.

Sequence:

• Ferrous Forerunner dies
• Deathknell triggers (twice due to Svellsongur's effect)
• Both Deathknell triggers resolve while Svellsongur is still attached
• Cards then go to trash

Nuances:

• This combination is not currently possible in constructed play because Ferrous Forerunner and Svellsongur are different colors (red and green)
• This interaction can occur in sealed format