I've used this deck to climb to rank #1 on ladder. Rakoans and crystal spice have amazing synergy.
1) Rakoan decks have the best cheap cards in the game (illusionist, shield mates), but they don't have enough late-game cards, and much likes sac decks they have problems with card draw because most of their cards have low cost. Crystal spice solves both those issues.
2) All the finishers in this deck are wild: champions and crystal spice. This is great for land development. In a typical game I build the six wild lands defensively (both sides), and then push up double neutral when I'm ready to make an aggressive push.