Aegis of the Hats

Vigilance
Once per turn, when a non-token creature enters
the battlefield under your control, create
a 1/1 white human lawyer creature token with
"When this creature attacks, detain target
non-land permanent an opponent controls."
{w}{u},{t}: Target creature you control gains lifelink
and indestructible until the end of the turn.
Partner with Son of the Ocean's Song