Serena the Pious

Serena the Pious enters the battlefield with 8
Piety counters on it. Piety counters give -1/0.
{4}{w}: Gain life equal to the number of Piety
counters on Serena the Pious.
{b}{t}: Add or remove a Piety counter from
Serena the Pious. If a Piety counter is removed
this way, deal 2 damage to any target.