Resplendent Angel This is the card in those angels deck on the Arena ladder that really shut the door on your aggro deck when it comes down
Creatures (25) 4 Llanowar Elves 4 Birds of Paradise 4 River Boa 4 Blastoderm 4 Ancient Hydra 2 Rith, the Awakener 3 Jade Leech Lands (24) Spells (11) Sideboard Kiblers Red Zone decks was miles ahead of its time, going even bigger than the Fires of Yavimaya decks that usually housed Blastoderm, thanks to Rith, the Awakener
Since you can swing with this too with ETB non-haste stuff, this should replace your Coastal Piracy stuff in some decks if you need the space, but I like them all in the same boat
With Miirym, generating Treasures allows you to cast expensive dragon creatures and copy them while keeping enough mana open for removal and counter spells
when you exert him to Quest, you ready all cards in your Inkwell