Worldfire | Hive Mind | Thoughtseize

(and one other card)

({7} magic symbol) ({B} magic symbol) ({R} magic symbol) ({R} magic symbol) ({R} magic symbol) available.

Activate
Emergence Zone's second ability by paying ({1} magic symbol) and tapping it, allowing you to cast spells this turn as though they have flash.
Cast
Thoughtseize by paying ({B} magic symbol) .
Hive Mind triggers, causing each opponent to create a copy of
Thoughtseize.
Holding priority, cast
Worldfire by paying ({6} magic symbol) ({R} magic symbol) ({R} magic symbol) ({R} magic symbol) .
Hive Mind triggers, causing each opponent to create a copy of
Worldfire.
Resolve each
Worldfire on the stack, exiling all permanents, all cards in all hands and graveyards, and setting each player's life total to one.
Resolve the first opponent's copy of
Thoughtseize, causing them to lose 2 life.
The opponent loses the game due to having less than zero life.
Repeat from step 7 for each remaining opponent.