Take the Tower

When Take the Tower enters the battlefield,
each player creates a 0/4 artifact token with
defender.
Whenever a player loses life, they gain damage
counters equal to the life lost.
At the beginning of your upkeep, if there is a
player with the most damage counters, that
player chooses a creature they control. That
creature is exiled. Then each player loses all
damage counters. Exile Take the Tower.