Lagiacrus

Whenever Lagiacrus becomes tapped or untapped, you may
tap or untap another target permanent.

Whenever you cast a blue spell, you may pay {u}. If you do, untap or tap Lagiacrus. Activate this ability only once each
turn.

Diving (This creature can only be blocked by creatures with
diving. This creature can only block blue creatures or
creatures with diving.)

Lagiacrus, lord of the sea and scourge of Moga.