This is my favorite aggressive deck in Modern currently. It plays a variety of mana dorks to accelerate into cards like Elvish Archdruid and Ezuri, Renegade Leader. Splashing black in our deck gives access to Shaman of the Pack which can let us kill our opponent through a stalled board. In games that go a bit longer this configuration of Elves can also generate card advantage with Collected Company and Lead the Stampede.
I have a full primer on this deck you can read on CoolStuff Inc here.