Darrow O'Lykos, The Reaper

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 only during combat.

"Live for more." - Eo