While there are a lot of fun, new cards in M15, we also have a trio of artifacts hitting my top three, and thats odd
In general Expressive Iteration is a great card
The aim of Scions and Spellcraft is to gain advantage through the casting of non-creature spells with Yshtolas sorcerous proclivities making her the perfect face for the deck
While four mana to activate and only a single target for the damage, the Bosh, Iron Golem text (geez, how outclassed is Bosh nowadays compared to this) is harder to abuse
Kyler snowballs like crazy in token-heavy builds and makes your board downright terrifying if left unchecked
Azurite Sea saw artworks that leaned into a highly unique theme, with characters from the main set etched against a map-like backdrop, to keep in lockstep with the seafaring theming