Alistair, the Brigadier Foil

Legendary Creature — Human Soldier

Whenever you cast a historic spell, create a 1/1 white Soldier creature token. (Artifacts, legendaries, and Sagas are historic.) Whenever Alistair attacks, you may pay . If you do, creatures you control get +X/+X until end of turn, where X is the number of historic permanents you control.