The idea of the deck is pretty simple—it's overloaded with creatures, many of which function like spells, so we play a creature, get value from its enters-the-battlefield trigger, sacrifice it to Evolutionary Leap to find another creature, Whip of Erebos it back from the graveyard to reuse the enters-the-battlefield trigger, and finally, before it gets exiled by Whip of Erebos, sacrifice it to Evolutionary Leap again to find yet another creature from our library! The end result is a deck that's absolutely stuffed full of value and really good at grinding out long games.