RW:Arcbond targeting an indestructible creature you don't control immediately before it would take damage (such as after being declared a blocker)+Comeuppance=Infinite damage to all creatures and players except you.
This works because arcbond makes the creature deal the damage, which comeuppance prevents against you and deals damage to the creature which in turn deals damage to everything again until all other players are dead.
Works well with Purphoros as a commander among other things.
This works because arcbond makes the creature deal the damage, which comeuppance prevents against you and deals damage to the creature which in turn deals damage to everything again until all other players are dead.