When you spend mana to play another unit, create a random card in hand of equal cost. It costs 0 and is Fleeting.
Flavor Text
Despite its appetite for even the strangest sea-beasts, there are some monsters even Bilgewater's most experienced captains won't hunt. They speak of Sefirsa in whispered tones, as a hypnotic light moving deep beneath the waves; a monster perched upon a mass grave of sunken ships and drowned men.
