as long as the wandering emperor entered the battlefield this turn, you may activate her loyalty abilities any time you could cast an instant.
+1: put a +1/+1 counter on up to one target creature. it gains first strike until end of turn.
-1: create a 2/2 white samurai creature token with vigilance.
-2: exile target tapped creature. you gain 2 life.
The Wandering Emperor from Promo Pack: Kamigawa: Neon Destiny