Full Retreat

At the beginning of each end step, if you were attacked, put a retreat counter on Full Retreat.
Then, if a creature you controlled died this turn,
remove a retreat counter from Full Retreat.
At the beginning of your upkeep, if you have 3
retreat counters on Full Retreat, you win the
game.
You cannot win the game by any other means.
The raiders came to burn and pillage, but there were no victims to be found