Surtr, Ruler of Flame

As an additional cost to casting Surtr, Ruler of Flame, sell your soul to the devil.
Surtr, Ruler of Flame can block any number of creatures and deals full damage to all creatures he fights. When a player attacks a player controlling Surtr, Ruler of Flame, they may declare for any amount of attacking creatures they control taht Surtr, Ruler of Flame must block those creatures if able.
At start of Surtr, Ruler of Flame's controller's upkeep, Surtr, Ruler of Flame deals 2 damage to all of Surtr Ruler of F