Youre pretty much going to need blue in your commanders color identity for a sea creatures deck to make a lick of sense, but these should be your main guiding principles
That being the case, its not horribly uncommon for Faerie Mastermind to draw you three cards between the end of your turn and the beginning of your next
Well, Emptiness can be both actually, while tied to a 3/5 elemental body
Similar to Unholy Heat, the presence of Fury in the format has pushed out certain creatures, and in Furys case the card has almost entirely pushed out small-weenie decks from the format
Provided you didnt devastate your board with your first combat phase, you can simply do it all again for just two mana
Venser provides a ton for the deck: It's a 2-drop so it can come down turn 2 consistently and can be recast a few times