Flamehold Grappler

The copy is created on the stack, so it’s not “cast.” Abilities that trigger when a player casts a spell won’t trigger.

If the spell that’s copied has an X whose value was determined as it was cast, the copy will have the same value of X.

The copy created by Flamehold Grappler’s last ability resolves before the spell it’s copying. It resolves even if the original spell is countered before the copy is created.

If the spell has any targets, the copy will have the same targets unless you choose new ones. You may change any number of the targets, including all of them or none of them. The new targets must be legal.

A resolving copy of a permanent spell becomes a token. That token isn’t “created” and won’t interact with abilities that care about tokens being created.