The deck plays 18 creatures, all with enter-the-battlefield effects. This makes our Ephemerates very very strong and full of utility. With Ice-Fang it draws a card, it resets Omnath, and loops with Witness. Loops? Yes! You cast Ephemerate on Witness and pick up something you want. Then your Rebounded Ephemerate targets Witness again and picks up itself. This way you still have the Witness, the Ephemerate and one spell extra.
All of this is accompanied by 4 Wrenn and Six and 4 Teferi, Time Raveler. This package allows the deck to attack from different angles other than creatures. In addition, Teferi is a great maindeck answer to Cascade stuff and Wrenn is a good answer to small artifact creatures and mana dorks such as Noble Hierarch or Birds of Paradise.