Your search for "Seething Song 216" revealed the following:
Seething Song (C21) from Commander 2021, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Martina Pilcerova Card Text:Add RRRRR.
Seething Song (9ED) from Ninth Edition, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Martina Pilcerova Card Text:Add RRRRR to your mana pool.
Seething Song (Foil) (9ED) from Ninth Edition, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Martina Pilcerova Card Text:Add RRRRR to your mana pool.
Seething Song - DDG Reprint (PLST) from The List, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Jaime Jones Card Text:Add RRRRR to your mana pool.
Seething Song - C21 Reprint (PLST) from The List, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Martina Pilcerova Card Text:Add RRRRR.