The competition was brutal at Grand Prix Santiago, but rising above all else were Green-based decks. The combination of good two-drops and big finishers helped Green stomp over everyone else. This is clearly represented by the first two of our Top 5 Cards of Grand Prix Santiago.
Card #1: Somberwald Alpha
Somberwald Alpha overperformed in the Top 8, especially in the finals in the hands of Rodrigo Lopez against Tomoharu Saito. The wolf ensured that the blocking was a raw deal and that damage would get through. The +1/+1 ability was the icing on a very deadly cake.
Card #2: Joraga Invocation
Even an underpowered Overrun is still an Overrun. The battle between Martin Quiroga and Rodrigo Lopez in the Semifinals was a race to Joraga Invocation - with Quiroga possibly losing because he pulled the trigger too soon. Still, it closed out a huge number of games over the weekend, pushing into one of the Top 5 cards.
Card #3: Chandra, Fire of Kaladesh
Both undefeated players from Day 1, Jorge Guerra and Christian Flores had Chandra, Fire of Kaladesh in their decks. One of the most aggressive Planeswalkers, she serves as an inevitable conclusion both in a damage race, and when the board stalls out. Though we didn't get to see the combination with Chandra's Ignition (another card proven powerful over the weekend) she was still a key player in the Sealed portion.
Card #4: Reave Soul
In an aggressive format such as Origins, the ability to slow your opponent right down on Turn 2 is critical for control decks, and Reave Soul is the best tool in the format for doing so. The ability to hit a renowned Topan Freeblade or Undercity Troll (if the opponent is tapped out, of course) makes this card so important for decks that want to play the long game.
Card #5: Suppression Bonds
Though 4 mana is a lot, it's one of the few cards that can deal with virtually any creature in the format (let's pretend Gaea's Revenge doesn't exist for a second). Considering that most White decks want to play creatures on Turns 2 and 3, then ensure they get through from then on, the casting cost isn't that troublesome. A well balanced card for the Origins Limited environment.