Top 3 Best Boosters

1. Overgrown Foxy: Randomly boosts a certain stat every 4s, stacks and it has 3 placements!
2. Spring Duo: 
   Has 2 modes, a damage and range boosting one and a CD boosting one. One deals more DPS and the other focuses more on boosting. Great hybrid unit.
3. Popcorn Bot: While the boost seems low, it can stack with others making it great.