What counts as 'playing a spell' for triggered abilities like Ravenbloom Student? Specifically, does a spell countered by Defy still trigger 'when you play a spell' effects?

Ruling: Play effect triggers only occur after a card is resolved. A card that is countered (such as by Defy) will not count as being played for triggered abilities like Ravenbloom Student.

Nuances:

• Darius can see himself as the second card played for his own ability
• Cruel Patron cannot sacrifice himself because additional costs are paid before the unit hits the board