Serene Watchman

Vigilance, Indestructible
When this creature blocks a creature, that
creature can't attack during its controller's
next turn.
Inscribe {3}{w}{u} (Exile this card from your hand inscribing a creature you control. It gets +2/+2
and gains the types, colors, and other abilities of
this card. You may activate this ability only when
you could cast a sorcery.)