Battle of Trenton

Whenever Battle of Trenton enters the battlefield
or during your up keep you may choose one that
has not been chosen before—
•Creatures you control have persist until the end
of your next turn.
•Creatures your opponents control get -X/-X
where X is the amount of soldiers you control.
Until Battle of Trenton leaves the battlefield.
•Creatures you control get two +1/+1 counters.