Argalia, Blue Reverberation

Whenever Argalia, Blue Reverberation attacks a player, that player gains a reverberation counter.
Whenever a creature you control deals combat
damage to a player with reverberation counters
equal or greater to the toughness of Argalia,
Blue Reverberation, that player loses half of
their current health rounded down.
{u}, {u}: Target player gains a reverberation
counter.