Your search for "Upwelling 306" revealed the following:
Upwelling (Foil) (10E) from Tenth Edition, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Chippy Card Text:Mana pools don't empty at the end of phases or turns. (This effect stops mana burn.)
Upwelling (10E) from Tenth Edition, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Chippy Card Text:Mana pools don't empty at the end of phases or turns. (This effect stops mana burn.)
Upwelling (SCG) from Scourge, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: John Avon Card Text:Mana pools don't empty at the end of phases or turns. (This effect stops mana burn.)
Upwelling (Foil) (SCG) from Scourge, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: John Avon Card Text:Mana pools don't empty at the end of phases or turns. (This effect stops mana burn.)