Devourer of Sparks

Hexproof, Indestructible
Devourer of Sparks cost {5} more to cast for each
opponent.
Devourer of Sparks Cost {x} less to cast where
{x} is equal to the combined mana symbol
on each Planeswalker on the battlefield.
When Devourer of Sparks deals combat damage
to a player that player loses the game.