Plargg, Dean of Chaos // Augusta, Dean of Order

Other tapped creatures you control get +1/+0.
Other untapped creatures you control get +0/+1.
Whenever you attack, untap each creature you control, then tap any number of creatures you control.

{T}, Discard a card: Draw a card.
{4}{R}, {T}: Reveal cards from the top of your library until you reveal a nonlegendary, nonland card with mana value 3 or less. You may cast that card without paying its mana cost. Put all revealed cards not cast this way on the bottom of your library in a random order.

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The List

Augusta’s last ability triggers whenever you attack with any creatures, even if you didn’t attack with Augusta.

Augusta’s last ability untaps all creatures you control, not just the ones that attacked this turn. Then you choose which creatures to tap, if any.

Despite the term “other tapped creatures,” Augusta’s first ability doesn’t care whether Augusta is tapped or untapped. The same is true for the second ability. Both abilities apply as long as Augusta is on the battlefield.

Plargg, Dean of Chaos’s second ability allows you to cast the spell during that ability’s resolution, ignoring its normal timing restrictions.

Untapping an attacking creature doesn’t remove it from combat. It’s still attacking normally.