You can find out more about the Wilds of Eldraine here.
Cycling cant be countered with normal counterspells but effects that can counter activated abilities can counter cycling, like Nimble Obstructionist or Trickbind
Rootwater Shaman is pretty good in an auras deck that plays blue
That being said, it's a cool 3/4 flier that can either make 1/1 fliers or blink your creatures, both of which are extremely useful abilities, and all you need to trigger them is any noncreature spell
If this happens, Trickster's Elk's effect causes the enchanted permanent to remain a 3/3 green Elk creature even after the temporary effect making it a creature expires
(It's not a creature.) If an ability triggers whenever an opponent loses life and its effect causes you to gain life, such as the ability of Exquisite Blood, this will loop until either you win the game or a player takes an action to break the loop