Katarina, the Blade-Blossom

Whenever a Warrior attacks, you may have its controller create a 1/1 white Warrior creature token that's tapped and attacking.
{w}{u}{b}{r}{g}: Untap all attacking creatures.
They gain trample, lifelink, and haste until
end of turn. After this phase, there is an additional combat phase. Activate this ability
only during combat.