Storm King's Thunder by paying ({9} magic symbol) ({R} magic symbol) ({R} magic symbol) ({R} magic symbol) , copying the next instant or sorcery spell you cast nine times.
Cast
Prologue to Phyresis by paying ({1} magic symbol) ({U} magic symbol) .
Storm King's Thunder triggers, copying
Prologue to Phyresis nine times.
Resolve each
Prologue to Phyresis, causing each opponent to get ten poison counters and you to draw ten cards.
Each opponent loses the game due to having ten or more poison counters.