Barathra, Priestess of Ula

Islandwalk
Whenever Barathra, Priestess of Ula attacks an opponent, you may put an Kraken, Leviathan, Octopus, or Serpent creature card from your
hand onto the battlefield tapped and attacking
that opponent.
"False gods! I'll have my revenge if I have to bend
every sea and storm to my will."