Yes, since emerge counts as casting a spell, this opens it up to being countered as well
Each time the Ring tempts you, you must choose a creature if you control one
2024-06-07 Some triggered abilities that state that you "may pay" a certain amount of describe an effect that happens "If you do." In that case, no player may take actions to try to stop the ability's effect after you make your choice
A particular focus should be given to this Charizard card's ability
For example, it might be smart to keep a Pokmon with an ability in your hand until you intend to use it
the pikachu at the bottom is like 5-10, misty's tears (naked misty) is around 10, venusaur is maybe 7 in that condition, rocket moltres = 2-3, surfing pikachu = 10, your most valuable one is the japanese mewtwo at 40-50