When does Ravenbloom Student's 'whenever you play a spell' trigger occur - when the spell is put on the chain or after it resolves?

Ruling: A card is only considered "played" once it has finished the whole process of play, which includes resolving. Ravenbloom Student triggers after the spell has resolved.

Nuances:

• This creates an interaction where the triggered ability opens a new chain after the original chain empties, potentially allowing the active player to play multiple action spells in a row without the opponent being able to respond at action speed
• This interaction appears unintended based on community discussion, as it prevents normal focus passing in an open game state