Kalara, the Tidebringer

Islandwalk, Trample

Tidal Mastery -Whenever Kalara, the Tidebringer attacks, you may tap target creature an opponent controls. It doesn’t untap during its controller’s next
untap step.
Tidecaller's Command -{2}{u}: Untap another target
Whale you control. It gains hexproof until end
of turn.
"With a single stroke of her tail, she commands the
tides to her will."