Does a copy of a spell count as being cast for cards that trigger when a spell is cast?

When a spell is copied — for example by Twincast or a card like Strionic Resonator copying a triggered ability — the copy is placed directly onto the stack without being cast. This is a fundamental distinction in the rules.

CR 706.10 states that a copy of a spell is created on the stack and is not cast. CR 603.1 defines triggered abilities as triggering when their trigger condition is met; if the trigger says 'whenever a spell is cast,' it looks specifically for the act of casting (CR 601.2), which a copy bypasses entirely.

Casting a spell involves a specific process: announcing it, paying costs, choosing targets, etc. (CR 601.2). A copy skips all of this and simply appears on the stack as a new object, fully formed. It is never 'cast,' so cast-triggered abilities never see it.

Concrete example: You control Goblin Electromancer and your opponent has a permanent that reads 'Whenever an opponent casts an instant or sorcery spell, draw a card.' You cast Lightning Bolt, triggering your opponent's ability once. Then you use Twincast to copy the Bolt — your opponent does NOT draw a second card, because the copy was never cast.

Note: some cards specifically trigger on copies or use broader wording like 'whenever a spell is put onto the stack,' which would catch copies. Always check the exact wording of the triggering condition.