The Three Vigorous War Pigs

Whenever a boar creature you control attacks,
create a 2/2 green Boar creature token.
Whenever a boar enters the battlefield, target
boar you control gain flying until end of turn.
Whenever 7 or more boar creatures you control
deal combat damage to a player, untap all
creatures that attacked this combat. There is an additional combat step after this step. This ability activates only once each turn.