1. Sometimes, even when you remove Leblanc from the field, you still benefit from her origin/classes.
Basically, you will permanently have 1 woodland, 1 mage and 1 assassin until the end of the game.
I believe many people already know this as the woodland bug.
2. When Maokai is duplicated by woodland synergy, sometimes, its size gets bigger.
3. When you have force of nature, it permanently increases your team's size, regardless of its location (field, waiting spot or even item slot).