Helix of the Pure

Helix of the Pure enters the battlefield tapped.
Whenever a player casts a spell, put a charge counter on Helix of the Pure.
{4}, {t}, Sacrifice Helix of the Pure: Create X 1/1 white Soldier tokens with vigilance or put X +1/+1 counters on target attacking creature, where X is the number of charge counters on Helix of the Pure.
Only one helix can incite such vigilance and honor.