Blightsteel Colossus + Legion Loyalty

Blightsteel Colossus
Legion Loyalty

Requires
All permanents on the battlefield. Blightsteel Colossus does not have summoning sickness. Opponents are unable to block and kill your creatures.
Steps
  1. Declare Blightsteel Colossus as an attacker
  2. Blightsteel Colossus' myriad ability triggers, creating a token copy of itself attacking each other opponent
  3. Deal combat damage with each Blightsteel Colossus, giving each opponent eleven poison counters
  4. Each opponent loses the game due to having ten or more poison counters
Results
Each opponent loses the game.