Tifa, Martial Artist (Borderless) (FIC-206)

Melee (Whenever this creature attacks, it gets +1/+1 until end of turn for each opponent you attacked this combat.)

Whenever one or more creatures you control with power 7 or greater deal combat damage to a player, untap all creatures you control.
If it's the first combat phase of your turn, there is an additional combat phase after this phase.