Vincent, Vengeful Atoner can get in for damage easily, and he will grow surprisingly quickly
Even in a depowered deck, you can find Salt Marsh, Jwar Isle Refuge, Frost Marsh, and Secluded Glen to make the other colors in a deck built around The Mimeoplasm or something
Kastral, the Windcrested is the primary way to get Birds back from the graveyard
Filibuster is a bit harder to replace, but Retether is a great alternative
Uthros, Titanic Godcore (EOE) $22.63 Like Evendo, Uthros, Titanic Godcore is a reminder that Tolarian Academy is strong
There are a few aspects that hold it back from being more complex and competitive, namely a lack of card draw and ways to mount a comeback and counter the opponent, but those issues may be alleviated as the game evolves