Each opponent loses the gameExile all cards in hands and graveyardsExile all permanentsNear-infinite lifelossMass Land Denial
How it works
Cast Worldfire by paying 6, exiling all permanents, all cards in all hands and graveyards, and setting each player's life total to one.
Parallax Wave leaves the battlefield, returning Kediss and Bloodswarn Steward from exile to the battlefield.
Deal combat damage to an opponent with Kediss.
The opponent dealt damage loses the game due to having less than zero life.
Kediss triggers, dealing damage equal to the combat damage dealt to each other opponent.
Each other opponent loses the game due to having less than zero life.
This explosive combo resets the entire game using Worldfire to wipe away all permanents, hands, and graveyards while setting everyone's life total to a precarious one. Before that reset happens, Parallax Wave cleverly preempts the devastation by exiling your own commanders—Kediss, Emberclaw Familiar and Bloodswarn Steward—so they safely return to the battlefield when the enchantment subsequently leaves. Urabrask the Hidden ensures those returning commanders don't have to wait around, granting them immediate haste so they can charge into combat. Once Kediss strikes an opponent for just one point of combat damage, its trigger deals that exact same damage to each remaining opponent, instantly finishing off the entire table since everyone is sitting at a single life point.