Emerald is typically an ink colour that feels classically mischievous, punishing opponents by forcing them to discard cards, lose characters and even lore
On the offense, Sauron slowly but surely builds up an Orc army as the opponent casts spells, making opponents feel like they're sealing their own doom just by playing cards
Tersa Lightshatter is Faithless Looting on a body, with Haste
Did I forget any
As you cast spells of any color or type, you can put a nice +1/+1 counter on your Thopter if the mana spent was greater than its power, which plays very nicely with the 1 power, and three cost and flying
Though Glin, Dwarf Emissary is rightfully restricted to one treasure per turn, you get access to really powerful capabilities and that is a repeatable source of treasure and the power to goad any creature for a small fee