How does Wary Hunter work?
This effect makes it so that if another Card uses B without having used A that turn, it can't B Wary Hunter.
Switching two Cards, or placing a Card from outside of the Dig Site, does NOT count as a A.
However, the A can be a result of another effect.
For example, Mummy and Owl are both normally unable to hit Hunter with their B, but if you Triggered Gathering Shadows to A Owl before you Trigerred its Effect, it would be able to!
How does Hunting Grounds work?
While Hunting Grounds is Face-Up, it gives other Cards Food Chain 2, but only while resolving other Food Chain Effects - so those Cards don't get to USE Food Chain.
For example, in the example below, say you flipped up the Lizard Carving. While using its Effect, you can consider the face-down black Card and the Painted Owl as having Food Chain 2. However, if it was the black deck's turn and they flipped their face-down card, its Effect would NOT end with Food Chain 2.
Also, note that it does not overwrite other Food Chain effects - so Migrating Butterflies is still Food Chain 1.
Do Perpetual Motion cards get flipped down?
Perpetual Motion cards trigger their Effects no matter where you place your Card for turn - meaning that even if you place one next to it, it'll trigger instead of flipping down.
On your Opponents' turns, they are flipped down as normal.
How does Spirited work?
If a Card has Spirited, and you place your Card for Turn next to it while it's Face-Up, Trigger its Effect instead of flipping it down.
An Opponent placing their Card will still flip it down.