Burn spells that hit all players (or multiple players), so Syr Carah's ability reveals several cards for me to play.
So text like: "damage to each player", "damage to each opponent", "damage to any number of targets", "damage to X targets", "damage divided as you wish"
Equipment that gives indestructible helps for some of the sweepers.
Still tweaking with this deck; I might replace some of the worse burn spells with more mana rocks, so you can chain burn spells better after a while.
Click here for a text version of this decklist
Click here for my EDH Commander decks