At three mana, this is reasonably priced, so I can see a lot of decks running it as a budget Heroic Intervention
The decks focus is on lands, and that means having some lands that are actually exciting to play
II, III - Until end of turn, whenever a Kraken, Leviathan, Merfolk, Octopus, or Serpent attacks, draw a card
The joke with this card in The Brothers' War Limited was that it only actually had two modes: create some tokens and distribute +1/+1 counters
So, no matter whether you drafted or not, you were affected by those choices, even if those choices were not ones that made the booster experience better for you
Fathomless descent Souls of the Losts power is equal to the number of permanent cards in your graveyard and its toughness is equal to that number plus 1