From appealing subjects to older cards disappearing over time and even printing errors, there are many factors involved in determining which are the very rarest Pokmon cards, which in turn can greatly affect their value
(6/23/2020) If an opponent gains control of your creature and it phases out and the duration of the control-change effect expires before it phases in, that permanent phases in under your control as that opponent's next untap step begins
You can target 1 "Therion" monster or 1 Psychic monster in your GY
Crackling Doom will probably have a weekend price of $4 Unless something usurps Mantis Rider, I expect the same of it this weekend
There are over 100 of these side quests, and they involve all sorts of tasks, such as battles, catching certain Pokemon, teaching Pokemon specific moves, trading, evolving, acquiring certain items, doing parkour, and a lot more