Argalia, Blue Reverberation

{u}{t}: Put a reverberation counter on target
creature or plainswalker you don't control.
Whenever a creature with one reverberation
attacks, untap Argalia. Whenever a creature
with two reverberation attacks, Argalia untaps
and you draw a card. Whenever a creature with
three or more reverberation attacks, Argalia
untaps, you draw a card, and you may deal 3
damage to all creatures and plainswalkers with a reverberation counter on them.