MTG >Combos >Nivix Guildmage +Seething Song +Biomancer's Familiar +Stonework Packbeast +

Cast Seething Song and activate Nivix Guildmage to copy it When the copy resolves, retain priority and pay two red mana to add a blue mana with Stonework Packbeast and copy Seething Song again Repeat the process for infinite mana.