Undead Charge

After a creature you control leaves the battlefield
and all of its' death triggered abilities resolve, it is exiled by Undead Cavalry.
If you would lose the game, end the current game
step immediately stopping all unresolved spells
and abilities, then begin combat with all creatures exiled by Undead Cavalry tapped and attacking.
You cannot lose during that combat, but
you lose the game at the end of it.