Add a power boost and you're winning the game in any going wide deck like Simic Ramp, Gruul Aggro or Selesnya Tokens
Each time you exile a creature, you pile counters onto one of your symbiotes, which quickly turns them into massive threats
Of note, Fortunes Favor targets and Saurons Ransom chooses, so you can choose an opponent with hexproof with the newer version
This means that if you are able to get some +1 counters on it or it is being buffed by other cards then X could be pretty high and almost guarantees you a card draw each time
The other thing about Spirits being a typal theme is that as more cards are printed that let you choose a creature type to get benefits, there will always be cards to pick up to improve your Spirit deck
Despite the strategy, you'll be far from passive when playing with this deck, and it can be a lot of fun to endlessly frustrate your opponents who are desperate to send their biggest creatures your way for devastating attacks