Does Ember Monk trigger (+2) each time you play a hidden card, or only the first time? Same question for Ravenbloom Student with spells.

Ruling: Ember Monk triggers each time you play a hidden card, not just the first time. The same applies to Ravenbloom Student with spells.

Nuances:

• In Riftbound, triggers activate every time the condition is met unless the card explicitly says "first time"
• Cards that limit to once per turn will explicitly state "first time" in their text
• "Each time" is not part of the standard trigger templating in Riftbound; the default "when [trigger], then [effect]" format means it happens every time